How to access the model from the controller in zend?

What should I do if Ubuntu on VirtualBox is stuck in the bootup screen?

• Please see this picture: I have been playing Ubuntu on VirtualBox for quite some time, but after I installed some applications, and tried to reboot again, it won't go to the comand line prompt. It's just stuck there(see the capture). I can SSH to system and perform various tasks, which means that it must be running okay, but how is it that it's just stuck there in the VirtualBox? What should I do about it? Any suggestion would be greatly appreciated! P.S. : here is the log from dmesg: [    0.000000] Initializing cgroup subsys cpuset [    0.000000] Initializing cgroup subsys cpu [    0.000000] Linux version 3.2.0-23-generic (buildd@crested) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu4) ) #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012 (Ubuntu 3.2.0-23.36-generic 3.2.14) [    0.000000] Command line: BOOT_IMAGE=/vmlinuz-3.2.0-23-generic root=/dev/mapper/ubuntu-root ro [    0.000000] KERNEL supported cpus: [    0.000000]   Intel GenuineIntel [    0.000000]   AMD AuthenticAMD [    0.000000]   Centaur CentaurHauls [    0.000000] BIOS-provided physical RAM map: [    0.000000]  BIOS-e820: 0000000000000000 - 000000000009fc00 (usable) [    0.000000]  BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved) [    0.000000]  BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved) [    0.000000]  BIOS-e820: 0000000000100000 - 000000001fff0000 (usable) [    0.000000]  BIOS-e820: 000000001fff0000 - 0000000020000000 (ACPI data) [    0.000000]  BIOS-e820: 00000000fffc0000 - 0000000100000000 (reserved) [    0.000000] NX (Execute Disable) protection: active [    0.000000] DMI 2.5 present. [    0.000000] DMI: innotek GmbH VirtualBox, BIOS VirtualBox 12/01/2006 [    0.000000] e820 update range: 0000000000000000 - 0000000000010000 (usable) ==> (reserved) [    0.000000] e820 remove range: 00000000000a0000 - 0000000000100000 (usable) [    0.000000] No AGP bridge found [    0.000000] last_pfn = 0x1fff0 max_arch_pfn = 0x400000000 [    0.000000] MTRR default type: uncachable [    0.000000] MTRR variable ranges disabled: [    0.000000] x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106 [    0.000000] CPU MTRRs all blank - virtualized system. [    0.000000] initial memory mapped : 0 - 20000000 [    0.000000] Base memory trampoline at [ffff88000009a000] 9a000 size 20480 [    0.000000] init_memory_mapping: 0000000000000000-000000001fff0000 [    0.000000]  0000000000 - 001fe00000 page 2M [    0.000000]  001fe00000 - 001fff0000 page 4k [    0.000000] kernel direct mapping tables up to 1fff0000 @ 1ffed000-1fff0000 [    0.000000] RAMDISK: 1e76d000 - 1f57a000 [    0.000000] ACPI: RSDP 00000000000e0000 00024 (v02 VBOX  ) [    0.000000] ACPI: XSDT 000000001fff0030 00034 (v01 VBOX   VBOXXSDT 00000001 ASL  00000061) [    0.000000] ACPI: FACP 000000001fff00f0 000F4 (v04 VBOX   VBOXFACP 00000001 ASL  00000061) [    0.000000] ACPI: DSDT 000000001fff0410 01B96 (v01 VBOX   VBOXBIOS 00000002 INTL 20100528) [    0.000000] ACPI: FACS 000000001fff0200 00040 [    0.000000] ACPI: SSDT 000000001fff0240 001CC (v01 VBOX   VBOXCPUT 00000002 INTL 20100528) [    0.000000] No NUMA configuration found [    0.000000] Faking a node at 0000000000000000-000000001fff0000 [    0.000000] Initmem setup node 0 0000000000000000-000000001fff0000 [    0.000000]   NODE_DATA [000000001ffe8000 - 000000001ffecfff] [    0.000000]  [ffffea0000000000-ffffea00007fffff] PMD -> [ffff88001de00000-ffff88001e5fffff] on node 0 [    0.000000] Zone PFN ranges: [    0.000000]   DMA      0x00000010 -> 0x00001000 [    0.000000]   DMA32    0x00001000 -> 0x00100000 [    0.000000]   Normal   empty [    0.000000] Movable zone start PFN for each node [    0.000000] early_node_map[2] active PFN ranges [    0.000000]     0: 0x00000010 -> 0x0000009f [    0.000000]     0: 0x00000100 -> 0x0001fff0 [    0.000000] On node 0 totalpages: 130943 [    0.000000]   DMA zone: 64 pages used for memmap [    0.000000]   DMA zone: 5 pages reserved [    0.000000]   DMA zone: 3914 pages, LIFO batch:0 [    0.000000]   DMA32 zone: 1984 pages used for memmap [    0.000000]   DMA32 zone: 124976 pages, LIFO batch:31 [    0.000000] ACPI: PM-Timer IO Port: 0x4008 [    0.000000] SMP: Allowing 1 CPUs, 0 hotplug CPUs [    0.000000] nr_irqs_gsi: 16 [    0.000000] PM: Registered nosave memory: 000000000009f000 - 00000000000a0000 [    0.000000] PM: Registered nosave memory: 00000000000a0000 - 00000000000f0000 [    0.000000] PM: Registered nosave memory: 00000000000f0000 - 0000000000100000 [    0.000000] Allocating PCI resources starting at 20000000 (gap: 20000000:dffc0000) [    0.000000] Booting paravirtualized kernel on bare hardware [    0.000000] setup_percpu: NR_CPUS:256 nr_cpumask_bits:256 nr_cpu_ids:1 nr_node_ids:1 [    0.000000] PERCPU: Embedded 28 pages/cpu @ffff88001fc00000 s83072 r8192 d23424 u2097152 [    0.000000] pcpu-alloc: s83072 r8192 d23424 u2097152 alloc=1*2097152 [    0.000000] pcpu-alloc: [0] 0 [    0.000000] Built 1 zonelists in Node order, mobility grouping on.  Total pages: 128890 [    0.000000] Policy zone: DMA32 [    0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-3.2.0-23-generic root=/dev/mapper/ubuntu-root ro [    0.000000] PID hash table entries: 2048 (order: 2, 16384 bytes) [    0.000000] Checking aperture... [    0.000000] No AGP bridge found [    0.000000] Calgary: detecting Calgary via BIOS EBDA area [    0.000000] Calgary: Unable to locate Rio Grande table in EBDA - bailing! [    0.000000] Memory: 485280k/524224k available (6566k kernel code, 452k absent, 38492k reserved, 6637k data, 920k init) [    0.000000] SLUB: Genslabs=15, HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1 [    0.000000] Hierarchical RCU implementation. [    0.000000] RCU dyntick-idle grace-period acceleration is enabled. [    0.000000] NR_IRQS:16640 nr_irqs:256 16 [    0.000000] Console: colour dummy device 80x25 [    0.000000] console [tty0] enabled [    0.000000] allocated 4194304 bytes of page_cgroup [    0.000000] please try 'cgroup_disable=memory' option if you don't want memory cgroups [    0.000000] Fast TSC calibration failed [    0.000000] TSC: Unable to calibrate against PIT [    0.000000] TSC: using PMTIMER reference calibration [    0.000000] Detected 2428.371 MHz processor. [    0.016010] Calibrating delay loop (skipped), value calculated using timer frequency.. 4856.74 BogoMIPS (lpj=9713484) [    0.016022] pid_max: default: 32768 minimum: 301 [    0.016073] Security Framework initialized [    0.016110] AppArmor: AppArmor initialized [    0.016117] Yama: becoming mindful. [    0.016223] Dentry cache hash table entries: 65536 (order: 7, 524288 bytes) [    0.016347] Inode-cache hash table entries: 32768 (order: 6, 262144 bytes) [    0.016409] Mount-cache hash table entries: 256 [    0.016585] Initializing cgroup subsys cpuacct [    0.016597] Initializing cgroup subsys memory [    0.016612] Initializing cgroup subsys devices [    0.016620] Initializing cgroup subsys freezer [    0.016628] Initializing cgroup subsys blkio [    0.016643] Initializing cgroup subsys perf_event [    0.016930] mce: CPU supports 0 MCE banks [    0.017101] using mwait in idle threads. [    0.017401] SMP alternatives: switching to UP code [    0.059001] Freeing SMP alternatives: 24k freed [    0.059043] ACPI: Core revision 20110623 [    0.059964] ACPI: setting ELCR to 0200 (from 0e20) [    0.060074] ftrace: allocating 27049 entries in 107 pages [    0.064161] weird, boot CPU (#0) not listed by the BIOS. [    0.064179] SMP motherboard not detected. [    0.068003] ------------[ cut here ]------------ [    0.068003] WARNING: at /build/buildd/linux-3.2.0/kernel/time/clockevents.c:47 clockevent_delta2ns+0x6b/0x80() [    0.068003] Hardware name: VirtualBox [    0.068003] Modules linked in: [    0.068003] Pid: 1, comm: swapper/0 Not tainted 3.2.0-23-generic #36-Ubuntu [    0.068003] Call Trace: [    0.068003]  [<ffffffff8106712f>] warn_slowpath_common+0x7f/0xc0 [    0.068003]  [<ffffffff8106718a>] warn_slowpath_null+0x1a/0x20 [    0.068003]  [<ffffffff8109a82b>] clockevent_delta2ns+0x6b/0x80 [    0.068003]  [<ffffffff81d0b052>] calibrate_APIC_clock+0x166/0x368 [    0.068003]  [<ffffffff81d0b2b2>] setup_boot_APIC_clock+0x5e/0x88 [    0.068003]  [<ffffffff81d0baa0>] APIC_init_uniprocessor+0xf9/0xfd [    0.068003]  [<ffffffff81d09277>] smp_sanity_check+0x6b/0x147 [    0.068003]  [<ffffffff81d094e1>] native_smp_prepare_cpus+0x18e/0x2a2 [    0.068003]  [<ffffffff81cfbc90>] kernel_init+0x76/0x14e [    0.068003]  [<ffffffff81666bf4>] kernel_thread_helper+0x4/0x10 [    0.068003]  [<ffffffff81cfbc1a>] ? start_kernel+0x3c7/0x3c7 [    0.068003]  [<ffffffff81666bf0>] ? gs_change+0x13/0x13 [    0.068003] ---[ end trace a7919e7f17c0a725 ]--- [    0.068003] APIC frequency too slow, disabling apic timer [    0.068003] SMP disabled [    0.068003] Performance Events: unsupported p6 CPU model 37 no PMU driver, software events only. [    0.068003] NMI watchdog disabled (cpu0): hardware events not enabled [    0.068003] Brought up 1 CPUs [    0.068003] Total of 1 processors activated (4856.74 BogoMIPS). [    0.068003] devtmpfs: initialized [    0.068003] EVM: security.selinux [    0.068003] EVM: security.SMACK64 [    0.068003] EVM: security.capability [    0.068003] print_constraints: dummy: [    0.068003] RTC time: 12:14:17, date: 08/21/12 [    0.068003] NET: Registered protocol family 16 [    0.068003] ACPI: bus type pci registered [    0.068003] PCI: Using configuration type 1 for base access [    0.068666] bio: create slab <bio-0> at 0 [    0.068869] ACPI: Added _OSI(Module Device) [    0.068878] ACPI: Added _OSI(Processor Device) [    0.068886] ACPI: Added _OSI(3.0 _SCP Extensions) [    0.068894] ACPI: Added _OSI(Processor Aggregator Device) [    0.069288] ACPI: EC: Look up EC in DSDT [    0.069601] ACPI: Executed 1 blocks of module-level executable AML code [    0.076355] ACPI: Interpreter enabled [    0.076370] ACPI: (supports S0 S5) [    0.076393] ACPI: Using PIC for interrupt routing [    0.079071] ACPI: No dock devices found. [    0.079083] HEST: Table not found. [    0.079092] PCI: Ignoring host bridge windows from ACPI; if necessary, use "pci=use_crs" and report a bug [    0.079164] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff]) [    0.079330] pci_root PNP0A03:00: host bridge window [io  0x0000-0x0cf7] (ignored) [    0.079336] pci_root PNP0A03:00: host bridge window [io  0x0d00-0xffff] (ignored) [    0.079342] pci_root PNP0A03:00: host bridge window [mem 0x000a0000-0x000bffff] (ignored) [    0.079347] pci_root PNP0A03:00: host bridge window [mem 0x20000000-0xffdfffff] (ignored) [    0.079403] pci 0000:00:00.0: [8086:1237] type 0 class 0x000600 [    0.079853] pci 0000:00:01.0: [8086:7000] type 0 class 0x000601 [    0.080667] pci 0000:00:01.1: [8086:7111] type 0 class 0x000101 [    0.081189] pci 0000:00:01.1: reg 20: [io  0xd000-0xd00f] [    0.081644] pci 0000:00:02.0: [80ee:beef] type 0 class 0x000300 [    0.082976] pci 0000:00:02.0: reg 10: [mem 0xe0000000-0xe0ffffff pref] [    0.088702] pci 0000:00:03.0: [8086:100e] type 0 class 0x000200 [    0.089426] pci 0000:00:03.0: reg 10: [mem 0xf0000000-0xf001ffff] [    0.090343] pci 0000:00:03.0: reg 18: [io  0xd010-0xd017] [    0.092796] pci 0000:00:04.0: [80ee:cafe] type 0 class 0x000880 [    0.093906] pci 0000:00:04.0: reg 10: [io  0xd020-0xd03f] [    0.094704] pci 0000:00:04.0: reg 14: [mem 0xf0400000-0xf07fffff] [    0.096067] pci 0000:00:04.0: reg 18: [mem 0xf0800000-0xf0803fff pref] [    0.097911] pci 0000:00:05.0: [8086:2415] type 0 class 0x000401 [    0.098056] pci 0000:00:05.0: reg 10: [io  0xd100-0xd1ff] [    0.098154] pci 0000:00:05.0: reg 14: [io  0xd200-0xd23f] [    0.098770] pci 0000:00:06.0: [106b:003f] type 0 class 0x000c03 [    0.099255] pci 0000:00:06.0: reg 10: [mem 0xf0804000-0xf0804fff] [    0.101904] pci 0000:00:07.0: [8086:7113] type 0 class 0x000680 [    0.102908] pci 0000:00:0d.0: [8086:2829] type 0 class 0x000106 [    0.103590] pci 0000:00:0d.0: reg 10: [io  0xd240-0xd247] [    0.104642] pci 0000:00:0d.0: reg 18: [io  0xd250-0xd257] [    0.105482] pci 0000:00:0d.0: reg 20: [io  0xd260-0xd26f] [    0.105914] pci 0000:00:0d.0: reg 24: [mem 0xf0806000-0xf0807fff] [    0.107031] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0._PRT] [    0.108088]  pci0000:00: Unable to request _OSC control (_OSC support mask: 0x1e) [    0.112361] ACPI: PCI Interrupt Link [LNKA] (IRQs *5 9 10 11) [    0.112641] ACPI: PCI Interrupt Link [LNKB] (IRQs 5 9 10 *11) [    0.112740] ACPI: PCI Interrupt Link [LNKC] (IRQs 5 9 *10 11) [    0.112851] ACPI: PCI Interrupt Link [LNKD] (IRQs 5 *9 10 11) [    0.113175] vgaarb: device added: PCI:0000:00:02.0,decodes=io+mem,owns=io+mem,locks=none [    0.113188] vgaarb: loaded [    0.113194] vgaarb: bridge control possible 0000:00:02.0 [    0.113338] i2c-core: driver [aat2870] using legacy suspend method [    0.113345] i2c-core: driver [aat2870] using legacy resume method [    0.113438] SCSI subsystem initialized [    0.113610] libata version 3.00 loaded. [    0.113701] usbcore: registered new interface driver usbfs [    0.113718] usbcore: registered new interface driver hub [    0.113814] usbcore: registered new device driver usb [    0.113989] PCI: Using ACPI for IRQ routing [    0.114003] PCI: pci_cache_line_size set to 64 bytes [    0.114275] reserve RAM buffer: 000000000009fc00 - 000000000009ffff [    0.114287] reserve RAM buffer: 000000001fff0000 - 000000001fffffff [    0.114430] NetLabel: Initializing [    0.114437] NetLabel:  domain hash size = 128 [    0.114443] NetLabel:  protocols = UNLABELED CIPSOv4 [    0.114472] NetLabel:  unlabeled traffic allowed by default [    0.125429] AppArmor: AppArmor Filesystem Enabled [    0.125483] pnp: PnP ACPI init [    0.125508] ACPI: bus type pnp registered [    0.125621] pnp 00:00: [bus 00-ff] [    0.125628] pnp 00:00: [io  0x0cf8-0x0cff] [    0.125634] pnp 00:00: [io  0x0000-0x0cf7 window] [    0.125640] pnp 00:00: [io  0x0d00-0xffff window] [    0.125646] pnp 00:00: [mem 0x000a0000-0x000bffff window] [    0.125652] pnp 00:00: [mem 0x20000000-0xffdfffff window] [    0.125698] pnp 00:00: Plug and Play ACPI device, IDs PNP0a03 (active) [    0.125721] pnp 00:01: [io  0x0060] [    0.125734] pnp 00:01: [io  0x0064] [    0.125742] pnp 00:01: [irq 1] [    0.125772] pnp 00:01: Plug and Play ACPI device, IDs PNP0303 (active) [    0.125785] pnp 00:02: [io  0x0000-0x000f] [    0.125791] pnp 00:02: [io  0x0080-0x008f] [    0.125797] pnp 00:02: [io  0x00c0-0x00df] [    0.125803] pnp 00:02: [dma 4] [    0.125832] pnp 00:02: Plug and Play ACPI device, IDs PNP0200 (active) [    0.125883] pnp 00:03: [irq 12] [    0.125916] pnp 00:03: Plug and Play ACPI device, IDs PNP0f03 (active) [    0.125935] pnp 00:04: [io  0x0378-0x037f] [    0.125941] pnp 00:04: [io  0x0778-0x077f] [    0.125947] pnp 00:04: [irq 7] [    0.125984] pnp 00:04: Plug and Play ACPI device, IDs PNP0400 (active) [    0.126566] pnp: PnP ACPI: found 5 devices [    0.126575] ACPI: ACPI bus type pnp unregistered [    0.134253] Switching to clocksource acpi_pm [    0.134296] PCI: max bus depth: 0 pci_try_num: 1 [    0.134308] pci_bus 0000:00: resource 0 [io  0x0000-0xffff] [    0.134313] pci_bus 0000:00: resource 1 [mem 0x00000000-0xfffffffff] [    0.134357] NET: Registered protocol family 2 [    0.134439] IP route cache hash table entries: 4096 (order: 3, 32768 bytes) [    0.134667] TCP established hash table entries: 16384 (order: 6, 262144 bytes) [    0.134756] TCP bind hash table entries: 16384 (order: 6, 262144 bytes) [    0.134830] TCP: Hash tables configured (established 16384 bind 16384) [    0.134838] TCP reno registered [    0.134848] UDP hash table entries: 256 (order: 1, 8192 bytes) [    0.134858] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes) [    0.134916] NET: Registered protocol family 1 [    0.134933] pci 0000:00:00.0: Limiting direct PCI/PCI transfers [    0.134988] pci 0000:00:01.0: Activating ISA DMA hang workarounds [    0.135031] pci 0000:00:02.0: Boot video device [    0.135426] ACPI: PCI Interrupt Link [LNKB] enabled at IRQ 11 [    0.135437] PCI: setting IRQ 11 as level-triggered [    0.135453] pci 0000:00:06.0: PCI INT A -> Link[LNKB] -> GSI 11 (level, low) -> IRQ 11 [    0.189337] pci 0000:00:06.0: PCI INT A disabled [    0.189495] PCI: CLS 0 bytes, default 64 [    0.190272] platform rtc_cmos: registered platform RTC device (no PNP device found) [    0.191041] audit: initializing netlink socket (disabled) [    0.191116] type=2000 audit(1345551256.188:1): initialized [    0.221770] Trying to unpack rootfs image as initramfs... [    0.264421] HugeTLB registered 2 MB page size, pre-allocated 0 pages [    0.266935] VFS: Disk quotas dquot_6.5.2 [    0.267030] Dquot-cache hash table entries: 512 (order 0, 4096 bytes) [    0.267652] fuse init (API version 7.17) [    0.267772] msgmni has been set to 947 [    0.280674] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 253) [    0.284474] io scheduler noop registered [    0.284487] io scheduler deadline registered [    0.284581] io scheduler cfq registered (default) [    0.284731] pci_hotplug: PCI Hot Plug PCI Core version: 0.5 [    0.284784] pciehp: PCI Express Hot Plug Controller Driver version: 0.4 [    0.284973] ACPI: Deprecated procfs I/F for AC is loaded, please retry with CONFIG_ACPI_PROCFS_POWER cleared [    0.285055] ACPI: AC Adapter [AC] (on-line) [    0.285128] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0 [    0.285140] ACPI: Power Button [PWRF] [    0.285226] input: Sleep Button as /devices/LNXSYSTM:00/LNXSLPBN:00/input/input1 [    0.285236] ACPI: Sleep Button [SLPF] [    0.286230] ACPI: Deprecated procfs I/F for battery is loaded, please retry with CONFIG_ACPI_PROCFS_POWER cleared [    0.286259] ACPI: Battery Slot [BAT0] (battery present) [    0.286463] ERST: Table is not found! [    0.286471] GHES: HEST is not enabled! [    0.286581] Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled [    0.288595] Linux agpgart interface v0.103 [    0.290577] ACPI: Battery Slot [BAT0] (battery present) [    0.291804] brd: module loaded [    0.300397] loop: module loaded [    0.300591] ahci 0000:00:0d.0: version 3.0 [    0.301355] ACPI: PCI Interrupt Link [LNKA] enabled at IRQ 5 [    0.301365] PCI: setting IRQ 5 as level-triggered [    0.301381] ahci 0000:00:0d.0: PCI INT A -> Link[LNKA] -> GSI 5 (level, low) -> IRQ 5 [    0.301555] ahci: SSS flag set, parallel bus scan disabled [    0.301779] ahci 0000:00:0d.0: AHCI 0001.0100 32 slots 1 ports 3 Gbps 0x1 impl SATA mode [    0.301790] ahci 0000:00:0d.0: flags: 64bit ncq stag only ccc [    0.302784] scsi0 : ahci [    0.302886] ata1: SATA max UDMA/133 abar m8192@0xf0806000 port 0xf0806100 irq 5 [    0.302957] ata_piix 0000:00:01.1: version 2.13 [    0.303598] scsi1 : ata_piix [    0.303726] scsi2 : ata_piix [    0.303820] ata2: PATA max UDMA/33 cmd 0x1f0 ctl 0x3f6 bmdma 0xd000 irq 14 [    0.303828] ata3: PATA max UDMA/33 cmd 0x170 ctl 0x376 bmdma 0xd008 irq 15 [    0.304330] Fixed MDIO Bus: probed [    0.304363] tun: Universal TUN/TAP device driver, 1.6 [    0.304370] tun: (C) 1999-2004 Max Krasnyansky <[email protected]> [    0.304597] PPP generic driver version 2.4.2 [    0.304797] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver [    0.304825] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver [    0.304873] ohci_hcd 0000:00:06.0: PCI INT A -> Link[LNKB] -> GSI 11 (level, low) -> IRQ 11 [    0.304957] ohci_hcd 0000:00:06.0: OHCI Host Controller [    0.305023] ohci_hcd 0000:00:06.0: new USB bus registered, assigned bus number 1 [    0.305095] ohci_hcd 0000:00:06.0: irq 11, io mem 0xf0804000 [    0.360820] hub 1-0:1.0: USB hub found [    0.360851] hub 1-0:1.0: 8 ports detected [    0.361256] uhci_hcd: USB Universal Host Controller Interface driver [    0.361319] usbcore: registered new interface driver libusual [    0.361364] i8042: PNP: PS/2 Controller [PNP0303:PS2K,PNP0f03:PS2M] at 0x60,0x64 irq 1,12 [    0.361920] serio: i8042 KBD port at 0x60,0x64 irq 1 [    0.361939] serio: i8042 AUX port at 0x60,0x64 irq 12 [    0.362112] mousedev: PS/2 mouse device common for all mice [    0.362675] input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input2 [    0.363309] rtc_cmos rtc_cmos: rtc core: registered rtc_cmos as rtc0 [    0.363370] rtc0: alarms up to one day, 114 bytes nvram [    0.363538] device-mapper: uevent: version 1.0.3 [    0.363640] device-mapper: ioctl: 4.22.0-ioctl (2011-10-19) initialised: [    0.363661] cpuidle: using governor ladder [    0.363667] cpuidle: using governor menu [    0.363673] EFI Variables Facility v0.08 2004-May-17 [    0.363915] TCP cubic registered [    0.364194] NET: Registered protocol family 10 [    0.364706] NET: Registered protocol family 17 [    0.364732] Registering the dns_resolver key type [    0.368520] PM: Hibernation image not present or could not be loaded. [    0.368542] registered taskstats version 1 [    0.464881] ata3.00: ATAPI: VBOX CD-ROM, 1.0, max UDMA/133 [    0.465510] ata3.00: configured for UDMA/33 [    0.547923] Freeing initrd memory: 14388k freed [    0.558973]   Magic number: 8:31:229 [    0.559145] rtc_cmos rtc_cmos: setting system clock to 2012-08-21 12:14:17 UTC (1345551257) [    0.559166] BIOS EDD facility v0.16 2004-Jun-25, 0 devices found [    0.559173] EDD information not available. [    0.620372] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300) [    0.620517] ata1.00: ATA-6: VBOX HARDDISK, 1.0, max UDMA/133 [    0.620525] ata1.00: 16777216 sectors, multi 128: LBA48 NCQ (depth 31/32) [    0.620654] ata1.00: configured for UDMA/133 [    0.620868] scsi 0:0:0:0: Direct-Access     ATA      VBOX HARDDISK    1.0  PQ: 0 ANSI: 5 [    0.621151] sd 0:0:0:0: Attached scsi generic sg0 type 0 [    0.621760] scsi 2:0:0:0: CD-ROM            VBOX     CD-ROM           1.0  PQ: 0 ANSI: 5 [    0.622323] sd 0:0:0:0: [sda] 16777216 512-byte logical blocks: (8.58 GB/8.00 GiB) [    0.622990] sr0: scsi3-mmc drive: 32x/32x xa/form2 tray [    0.623004] cdrom: Uniform CD-ROM driver Revision: 3.20 [    0.623188] sr 2:0:0:0: Attached scsi CD-ROM sr0 [    0.623259] sr 2:0:0:0: Attached scsi generic sg1 type 5 [    0.623577] sd 0:0:0:0: [sda] Write Protect is off [    0.623585] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00 [    0.623636] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [    0.649093]  sda: sda1 sda2 < sda5 > [    0.650883] sd 0:0:0:0: [sda] Attached SCSI disk [    0.653200] Freeing unused kernel memory: 920k freed [    0.653415] Write protecting the kernel read-only data: 12288k [    0.658314] Freeing unused kernel memory: 1608k freed [    0.663003] Freeing unused kernel memory: 1196k freed [    0.687978] udevd[84]: starting version 175 [    0.768423] usb 1-1: new full-speed USB device number 2 using ohci_hcd [    0.854697] e1000: Intel(R) PRO/1000 Network Driver - version 7.3.21-k8-NAPI [    0.854713] e1000: Copyright (c) 1999-2006 Intel Corporation. [    0.862636] ACPI: PCI Interrupt Link [LNKC] enabled at IRQ 10 [    0.862651] PCI: setting IRQ 10 as level-triggered [    0.862667] e1000 0000:00:03.0: PCI INT A -> Link[LNKC] -> GSI 10 (level, low) -> IRQ 10 [    1.357976] Refined TSC clocksource calibration: 2428.554 MHz. [    1.357993] Switching to clocksource tsc [    1.465229] e1000 0000:00:03.0: eth0: (PCI:33MHz:32-bit) 08:00:27:d3:1c:03 [    1.465243] e1000 0000:00:03.0: eth0: Intel(R) PRO/1000 Network Connection [    1.496390] input: VirtualBox USB Tablet as /devices/pci0000:00/0000:00:06.0/usb1/1-1/1-1:1.0/input/input3 [    1.496941] generic-usb 0003:80EE:0021.0001: input,hidraw0: USB HID v1.10 Mouse [VirtualBox USB Tablet] on usb-0000:00:06.0-1/input0 [    1.496980] usbcore: registered new interface driver usbhid [    1.496987] usbhid: USB HID core driver [    1.689262] EXT4-fs (dm-0): INFO: recovery required on readonly filesystem [    1.689276] EXT4-fs (dm-0): write access will be enabled during recovery [    1.842898] EXT4-fs (dm-0): orphan cleanup on readonly fs [    1.842922] EXT4-fs (dm-0): ext4_orphan_cleanup: deleting unreferenced inode 144181 [    1.842971] EXT4-fs (dm-0): ext4_orphan_cleanup: deleting unreferenced inode 143414 [    1.842984] EXT4-fs (dm-0): ext4_orphan_cleanup: deleting unreferenced inode 143413 [    1.842995] EXT4-fs (dm-0): ext4_orphan_cleanup: deleting unreferenced inode 143396 [    1.843006] EXT4-fs (dm-0): ext4_orphan_cleanup: deleting unreferenced inode 143395 [    1.843015] EXT4-fs (dm-0): 5 orphan inodes deleted [    1.843022] EXT4-fs (dm-0): recovery complete [    1.932701] EXT4-fs (dm-0): mounted filesystem with ordered data mode. Opts: (null) [    7.110913] ADDRCONF(NETDEV_UP): eth0: link is not ready [    7.138074] udevd[300]: starting version 175 [    7.184550] Adding 520188k swap on /dev/mapper/ubuntu-swap_1.  Priority:-1 extents:1 across:520188k [    7.199507] lp: driver loaded but no devices found [    7.313394] EXT4-fs (dm-0): re-mounted. Opts: errors=remount-ro [    7.481255] parport_pc 00:04: reported by Plug and Play ACPI [    7.493830] piix4_smbus 0000:00:07.0: SMBus base address uninitialized - upgrade BIOS or use force_addr=0xaddr [    7.670484] ip_tables: (C) 2000-2006 Netfilter Core Team [    7.677565] type=1400 audit(1345551264.614:2): apparmor="STATUS" operation="profile_load" name="/sbin/dhclient" pid=377 comm="apparmor_parser" [    7.677953] type=1400 audit(1345551264.614:3): apparmor="STATUS" operation="profile_load" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=377 comm="apparmor_parser" [    7.678172] type=1400 audit(1345551264.614:4): apparmor="STATUS" operation="profile_load" name="/usr/lib/connman/scripts/dhclient-script" pid=377 comm="apparmor_parser" [    7.736963] input: ImExPS/2 Generic Explorer Mouse as /devices/platform/i8042/serio1/input/input4 [    7.771065] nf_conntrack version 0.5.0 (3932 buckets, 15728 max) [    7.796636] ip6_tables: (C) 2000-2006 Netfilter Core Team [    8.205364] e1000: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX [    8.214896] ADDRCONF(NETDEV_UP): eth0: link is not ready [    8.214944] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready [    8.688530] snd_intel8x0 0000:00:05.0: PCI INT A -> Link[LNKA] -> GSI 5 (level, low) -> IRQ 5 [    8.831928] ppdev: user-space parallel port driver [    8.854456] e1000: eth0 changing MTU from 1500 to 576 [    8.871840] e1000: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX [    9.013148] intel8x0_measure_ac97_clock: measured 53597 usecs (8159 samples) [    9.013154] intel8x0: measured clock 152228 rejected [    9.212267] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready [    9.238847] init: failsafe main process (842) killed by TERM signal [    9.369083] Bluetooth: Core ver 2.16 [    9.372584] intel8x0_measure_ac97_clock: measured 54624 usecs (10560 samples) [    9.372591] intel8x0: measured clock 193321 rejected [    9.373244] NET: Registered protocol family 31 [    9.373253] Bluetooth: HCI device and connection manager initialized [    9.373263] Bluetooth: HCI socket layer initialized [    9.373270] Bluetooth: L2CAP socket layer initialized [    9.373289] Bluetooth: SCO socket layer initialized [    9.400240] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [    9.400247] Bluetooth: BNEP filters: protocol multicast [    9.406058] Bluetooth: RFCOMM TTY layer initialized [    9.406068] Bluetooth: RFCOMM socket layer initialized [    9.406075] Bluetooth: RFCOMM ver 1.11 [    9.473080] type=1400 audit(1345551266.410:5): apparmor="STATUS" operation="profile_load" name="/usr/lib/lightdm/lightdm/lightdm-guest-session-wrapper" pid=923 comm="apparmor_parser" [    9.475979] type=1400 audit(1345551266.410:6): apparmor="STATUS" operation="profile_replace" name="/sbin/dhclient" pid=924 comm="apparmor_parser" [    9.476872] type=1400 audit(1345551266.414:7): apparmor="STATUS" operation="profile_replace" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=924 comm="apparmor_parser" [    9.477104] type=1400 audit(1345551266.414:8): apparmor="STATUS" operation="profile_replace" name="/usr/lib/connman/scripts/dhclient-script" pid=924 comm="apparmor_parser" [    9.487842] type=1400 audit(1345551266.422:9): apparmor="STATUS" operation="profile_load" name="/usr/bin/evince" pid=925 comm="apparmor_parser" [    9.494166] type=1400 audit(1345551266.430:10): apparmor="STATUS" operation="profile_load" name="/usr/bin/evince//launchpad_integration" pid=925 comm="apparmor_parser" [    9.497434] type=1400 audit(1345551266.434:11): apparmor="STATUS" operation="profile_load" name="/usr/bin/evince//sanitized_helper" pid=925 comm="apparmor_parser" [    9.732496] intel8x0_measure_ac97_clock: measured 56168 usecs (8160 samples) [    9.732504] intel8x0: measured clock 145278 rejected [    9.732510] intel8x0: clocking to 48000 [    9.750580] init: alsa-restore main process (970) terminated with status 19 [    9.943775] vesafb: mode is 640x480x32, linelength=2560, pages=0 [    9.943782] vesafb: scrolling: redraw [    9.943787] vesafb: Truecolor: size=8:8:8:8, shift=24:16:8:0 [    9.943871] mtrr: your processor doesn't support write-combining [    9.944013] vesafb: framebuffer at 0xe0000000, mapped to 0xffffc90000380000, using 1216k, total 1216k [    9.945495] Console: switching to colour frame buffer device 80x30 [    9.947625] fb0: VESA VGA frame buffer device

• Answer:

  When GRUB starts - can you get it to load in 'Fail Safe Mode'?  If so -- choose that option in Grub and then as suggests -- uninstall postfix and sendmail.  You could try and turn off those daemons / services, but it is probably easier to uninstall them and try again. I have trouble believing they are the root of your issue, but if that was the last change - then start there. From reading the comments, it is not clear to me if the VBox Guest is SSH-able or if it is the Host machine that is SSH-able.  If you can SSH to the Guest, you can uninstall from there and tell it to reboot (without doing the Fail Safe thing).