Public bug reported:

Not sure how to file this: it's for the do-release-upgrade process for
kubuntu from 12.10 to 13.04.

After upgrading the login manager came up fine. When logging in there
was a message about qdbus from startkde:

if qdbus >/dev/null 2>/dev/null; then
    : # ok
else
    echo 'startkde: Could not start D-Bus. Can you call qdbus?'  1>&2
    test -n "$ksplash_pid" && kill "$ksplash_pid" 2>/dev/null
    xmessage -geometry 500x100 "Could not start D-Bus. Can you call qdbus?"
    exit 1
fi

The xmessage one.  invoking qdbus by hand on a text console gave a
message I can't remember.  Strace seemed to show that it was looking for
something it did not find.  This led me to look at qtchooser which also
did not work. "qtchooser -list-versions" listed nothing.

I tried to use apt-file to find the directories it looked in (found by
strace).  Then I tried to install qt5-default.  Then the message changed
to qdbus binary missing from some library directory specific to qt5.

When i installed qt4-default and reinstalled qdbus it was possible to
log in.

Kind of high threshold to get the upgraded machine to work.

Now upgrading a kubuntu VM with much fewer packages installed, I'll post
here what I learn.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: ubuntu-release-upgrader-core 1:0.192.10
ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
Uname: Linux 3.8.0-19-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
CrashDB: ubuntu
Date: Wed May  1 18:39:31 2013
MarkForUpload: True
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to raring on 2013-05-01 (0 days ago)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade raring

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https://bugs.launchpad.net/bugs/1175251

Title:
  kubuntu upgrade from 12.10 to 13.04 leaves system unusable

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