Unable to `do-release-upgrade -d` from oneiric to precise

[Janne Jokitalo]

I tried to run `sudo do-release-upgrade -d`, and stumbled into problems with:

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade:
E:Error, pkgProblemResolver::Resolve generated breaks, this may be
caused by held packages.

I used ppa-purge to get rid of a couple of PPA's used at that time, but it didn't help (and shouldn't, update-manager takes care of 3rd party software sources, right?).

Looked into /var/log/dist-upgrade/main.log, I see only one interesting line:

2012-03-31 23:18:49,581 DEBUG failed to SystemUnLock() (E:Not locked)

...but I'm attaching it anyway. Much, much more interesting is the /var/log/dist-upgrade/apt.log, which shows a number of broken packages. Attaching it too, obviously.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: update-manager 1:0.152.25.8
ProcVersionSignature: Ubuntu 3.0.0-17.30-generic 3.0.22
Uname: Linux 3.0.0-17-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Sat Mar 31 23:30:57 2012
InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to oneiric on 2012-03-31 (0 days ago)

[Janne Jokitalo (astraljava)]

There was a version conflict between rhythmbox and rhythmbox-data. Purging that app from my system resolved the issue, and the upgrade was possible.