Failed when trying to upgrade from 14.04 to 14.10 with "Could not determine the upgrade"

[Adrian McEwen]

I ran the software updater and then chose to upgrade to 14.10. I'm on 14.04.

During the "Setting new software channels" step I get an information dialog that:

"Third party sources disabled

Some third party entries in your sources.list were disabled. You can re-enable them after the upgrade with the 'software-properties' tool or your package manager."

The upgrade seems to continue okay after that for a while, but then (still in the "Setting new software channels" step) I'm told that:

"Could not determine 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."

I haven't upgraded to a pre-release version of Ubuntu, nor am I running the current pre-release version of Ubuntu. I'm sure I've got all sorts of unofficial software packages installed, but I'd need the installer to give me some more information about what's caused the problem before I'm going to go digging around looking for the culprit :-)

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.6
ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
Uname: Linux 3.13.0-43-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Wed Dec 31 09:59:28 2014
InstallationDate: Installed on 2012-11-24 (766 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2014-12-31 (0 days ago)
VarLogDistupgradeTermlog:

mtime.conffile..etc.update.manager.release.upgrades: 2014-10-28T22:02:09.340817

[Adrian McEwen (amcewen)]

After filing this I spotted the "no entry" icon in the system notifications by the date/time in the top-right corner of the screen. It would be handy if the dialog had pointed towards this, as that seems to show the details of the offending package.

I removed wine, which got a little further before eagle caused a problem. Removing that got further still but still failed, and didn't give me any additional info in the system notifications area.

Running "apt-get autoremove" removed some things but didn't fix matters.

It is now failing with the same "Could not determine the upgrade" error message, but no apt-get error icon in the system notifications area.

"apt-get check" comes back clean. I tried an "apt-get dist-upgrade" (before the "apt-get autoremove") which did install a bunch of additional packages, but hasn't fixed the problem.

Any hints for where I could look for further debugging info?