[Bug 1051487] [NEW] System boots to busybox after 10.04 -> 12.04.1 upgrade

[internic]

Public bug reported:

I was running an up-to-date version of Ubuntu lucid 10.04.4 LTS and used
update-manager to upgrade to 12.04.1 LTS.  After the upgrade was
completed, a reboot of the system ended midway in a BusyBox prompt.  If
I type exit at that prompt the boot seems to continue as normal and the
system boots to a usable (seemingly normal) desktop session.  This
behavior repeats on subsequent reboots.  Obviously I would like to have
the system boot normally and understand any underlying issue that may be
causing this behavior.

For this system uname -a outputs: Linux dirac 3.2.0-30-generic
#48-Ubuntu SMP Fri Aug 24 16:52:48 UTC 2012 x86_64 x86_64 x86_64
GNU/Linux

If you refer to the attached version of /var/log/messages, the busybox
prompt appears right after the message

Sep 15 22:42:41 dirac kernel: [    2.696442] usb 1-3.4: new full-speed
USB device number 4 using ehci_hcd

All subsequent messages occur after exiting the busybox prompt.

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: dist-upgrade

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https://bugs.launchpad.net/bugs/1051487

Title:
  System boots to busybox after 10.04 -> 12.04.1 upgrade

Status in “update-manager” package in Ubuntu:
  New

Bug description:
  I was running an up-to-date version of Ubuntu lucid 10.04.4 LTS and
  used update-manager to upgrade to 12.04.1 LTS.  After the upgrade was
  completed, a reboot of the system ended midway in a BusyBox prompt.
  If I type exit at that prompt the boot seems to continue as normal and
  the system boots to a usable (seemingly normal) desktop session.  This
  behavior repeats on subsequent reboots.  Obviously I would like to
  have the system boot normally and understand any underlying issue that
  may be causing this behavior.

  For this system uname -a outputs: Linux dirac 3.2.0-30-generic
  #48-Ubuntu SMP Fri Aug 24 16:52:48 UTC 2012 x86_64 x86_64 x86_64
  GNU/Linux

  If you refer to the attached version of /var/log/messages, the busybox
  prompt appears right after the message

  Sep 15 22:42:41 dirac kernel: [    2.696442] usb 1-3.4: new full-speed
  USB device number 4 using ehci_hcd

  All subsequent messages occur after exiting the busybox prompt.

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