[Bug 1410589] Re: Upgrade fails with no usable explanation

[Brian Murray]

*** This bug is a duplicate of bug 934371 ***
    https://bugs.launchpad.net/bugs/934371

** This bug has been marked a duplicate of bug 934371
   Unresolvable problem message does not help users and results in less useful bug reports

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Title:
  Upgrade fails with no usable explanation

Status in update-manager package in Ubuntu:
  New

Bug description:
  Attempting to run "do-release-upgrade -p" because the signature of a
  plain "do-release-upgrade" has a purportedly invalid signature.  This
  is an upgrade from an up-to-date 12.05.5-LTS to 14.04.1-LTS, pulling
  packages through squid-deb-proxy on another machine, using the
  command-line updater over ssh. The updater starts up, switches
  software sources, pulls down the new information, and then exits,
  telling me only:

  ...
  Calculating the changes

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  This can be caused by: 
  * Upgrading to a pre-release version of Ubuntu 
  * Running the current pre-release version of Ubuntu 
  * Unofficial software packages not provided by Ubuntu 

  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. 
  ...

  This is not particularly helpful, as it doesn't give me any clue
  whatsoever as to what packages are potentially conflicting, or if the
  problem is even on my end.  It would be nice if the tools indicated
  that there were debug logs somewhere, or game me a hint as to what
  packages are involved, or drew an ASCII-art guy on a bicycle from a
  1990's usenet signature block, or /something/ beyond simply taking its
  ball and going home.

  I suspect that there's an issue with using the postgres packages from
  the postgres repository rather than the official Ubuntu packages.  But
  that's just a wild guess based on previous conflicts rather than
  anything based on what's really going on.  I'll eventually track down
  what the problem is here, but meanwhile this is, I guess, a feature
  request for somewhat more usable failure messages.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.17
  ProcVersionSignature: Ubuntu 3.2.0-65.99-generic-pae 3.2.60
  Uname: Linux 3.2.0-65-generic-pae i686
  ApportVersion: 2.0.1-0ubuntu17.8
  Architecture: i386
  Date: Tue Jan 13 18:26:15 2015
  MarkForUpload: True
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: update-manager
  Symptom: ubuntu-release-upgrader-core
  UpgradeStatus: Upgraded to precise on 2015-01-14 (0 days ago)

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