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[Forest <1286836@xxxxxxxxxxxxxxxxxx>]

For the record:

This happened to me during a distribution upgrade from 13.10 (saucy) to 14.04 (trusty). When it happened, the release upgrade tool interrupted itself with a dialog box containing this alarming and not very helpful message:
Could not install the upgrades
The upgrade has aborted. Your system could be in an unusable state. A recovery will run now (dpkg --configure -a).

This dialog box was modal, preventing me from scrolling or copying the
text in the Terminal widget to see what really happened. The text
visible in the Terminal widget did not show up in any of the /var/log
/dist-upgrade/* logs, but it was clearly a python exception and stack
trace.

Upon closing the dialog box, the upgrade continued, contrary to what the
alarming message stated. (I guess the message was referring to one
particular package, not the overall release upgrade, but most end users
wouldn't know that, and even if they did the message didn't state which
package.)

As the upgrade continued, I was unable to copy & paste the stack trace
before it was pushed out of the Terminal widget's rather short scroll
buffer.

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Touch seeded packages, which is subscribed to libav in Ubuntu.
https://bugs.launchpad.net/bugs/1286836

Title:
  package libpostproc52 6:0.8.10-0ubuntu0.13.10.1 failed to
  install/upgrade: libpostproc52:amd64 6:0.git20120821-4 (Multi-Arch:
  no) is not co-installable with libpostproc52 which has multiple
  installed instances

Status in “libav” package in Ubuntu:
  Confirmed
Status in “libpostproc” package in Ubuntu:
  Confirmed

Bug description:
   -

  ProblemType: Package
  DistroRelease: Ubuntu 14.04
  Package: libpostproc52 6:0.8.10-0ubuntu0.13.10.1
  ProcVersionSignature: Ubuntu 3.13.0-14.34-generic 3.13.5
  Uname: Linux 3.13.0-14-generic x86_64
  ApportVersion: 2.13.2-0ubuntu5
  Architecture: amd64
  Date: Mon Mar  3 00:57:47 2014
  Dependencies:
   gcc-4.9-base 4.9-20140222-0ubuntu1
   libavutil51 6:0.8.10-0ubuntu0.13.10.1 [origin: unknown]
   libc6 2.19-0ubuntu2
   libgcc1 1:4.9-20140222-0ubuntu1
   multiarch-support 2.19-0ubuntu2
  ErrorMessage: libpostproc52:amd64 6:0.git20120821-4 (Multi-Arch: no) is not co-installable with libpostproc52 which has multiple installed instances
  InstallationDate: Installed on 2013-12-12 (79 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  SourcePackage: libav
  Title: package libpostproc52 6:0.8.10-0ubuntu0.13.10.1 failed to install/upgrade: libpostproc52:amd64 6:0.git20120821-4 (Multi-Arch: no) is not co-installable with libpostproc52 which has multiple installed instances
  UpgradeStatus: Upgraded to trusty on 2014-03-02 (0 days ago)

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