Lucid -> Precise trouble with do-release-upgrade

[Nils Kassube]

When I try to upgrade (a copy of) my main system from Lucid to Precise 
with the command "do-release-upgrade -d", I get the following message:

| 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.
| 
| 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 update-manager' in a terminal.

Well, I do have packages installed which were not provided by Ubuntu and 
I tried to upgrade to a pre-release version. Does it really mean I 
should not report the problem? After all I found a workaround for this 
situation by removing some packages which were installed from the Ubuntu 
repos. Here is a summary of the workaround:

1. I had installed the package "gcj-jdk" including dependencies. 
Removing these packages let the upgrade continue without the error 
message above.

2. However the upgrade stopped after a few packages were installed with 
a failure message concerning the package "lib32asound2". After also 
removing the packages which depended on this package (ia32libs, wine1.2, 
etc.) from a fresh copy of the system, I could successfully run the 
upgrade.

3. After the first reboot, I got the error message "Could not start D-
Bus. Can you call qdbus?" like it is mentioned at [1] (this is a Kubuntu 
system btw). After manually installing the package "qdbus", the system 
worked.

Please advise if and what I should report at launchpad.


Nils

[1] <https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/876936>