[Bug 992685] Re: Upgrade 11.10 to 12.04 fails on multiple machines (related to libjpeg8?)

[John Stultz]

Well, I did install all oneiric updates that were present over the
weekend before updating.  Although I'm confused as the ...13.3 apt was
reportedly published 4/25 and I did upgrades between 4/26 and 4/29. Even
so looking at the logs, they both list apt ....13.2.

Anyway, from the apt ....13.3 changelog it does sound like the issue has been hopefully addressed:
"  * Backport fixes from precise verison of apt, to fix multiarch upgrades
    from oneiric."

As my machines are already upgraded, I cannot "try the upgrade again".
I guess we can just hope its fixed and no one else hits this.

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https://bugs.launchpad.net/bugs/992685

Title:
  Upgrade 11.10 to 12.04 fails on multiple machines (related to
  libjpeg8?)

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

Bug description:
  On a few of my machines, when upgrading to 12.04 from 11.10 (both
  x86_64), the upgrade somehow failed.

  It appeared to finish successfully, but after rebooting, the login
  window had missing-icons (broken Xs in the upper right corner) and
  loaded no background image (only grid of dots). When I tried to log
  in, I got a blank screen and the mouse cursor would move, but nothing
  loaded.

  After switching to vt2, on a hunch I tried running "apt-get install
  -f", this prompted me that libjpeg8:i386 (i believe) would be
  installed. However, the system churned for quite a while (probably
  more then 10 minutes) setting up numourous other packages (including
  the kernel).  After that completed, I rebooted and everything was
  working fine.

  On a different machine, which uses LUKS, I saw the same problem, but
  it manifested in a much worse way. After the installation prompted me
  to reboot, the system would hang very early with a black screen and
  the caps key flashing.  After booting with quiet the splash removed, I
  saw that the kernel could not find the root device under /dev/mapper/.
  After playing around with some options to try to fix that, I ended up
  booting with one of the 11.10 kernels still present. This was able to
  boot the machine, but then I saw the same behavior as the first
  system. It seems the upgrade bombed out before building a proper
  initrd that supported dm.  I ran "apt-get install -f", and again
  libjpeg8 was noted as needing to be installed, and it confugured a
  number of packages (including the kernel - properly setting up the
  initrd), then I rebooted. Everything worked fine at that point.

  If I wasn't a developer this would be very terrifying.

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