Comment 5 for bug 1020680

With todays unattended-upgrade the same happened again: all packages related to kubuntu-desktop were automatically uninstalled in the course of the installation of the kde updates (to 4.8.4a).

If anybody has any idea how to track the cause down please give advice. I have no better idea than a reinstall to work around it.

unattended-upgrades.log has this:
    2012-07-20 10:09:11,182 INFO Packages that are upgraded: akregator <long list>
    2012-07-20 10:09:11,188 INFO Das dpkg-Protokoll wird in »/var/log/unattended-upgrades/unattended-upgrades-dpkg_2012-07-20_10:09:11.182564.log« gespeichert
    2012-07-20 10:35:00,879 INFO Alle Aktualisierungen wurden installiert

but this excerpt from unattended-upgrades-dpkg_2012-07-20_10:09:11.182564.log shows the packages were upgraded and then uninstalled (grep kmail unatt...564.log):
     Vorbereitung zum Ersetzen von kmail 4:4.8.4a-0ubuntu0.1 (durch .../kmail_4%3a4.8.4a-0ubuntu0.3_amd64.deb) ...
    Ersatz für kmail wird entpackt ...
    kmail (4:4.8.4a-0ubuntu0.3) wird eingerichtet ...
    Entfernen von kmail ...

also seen in $grep kmail /var/log/dpkg.log
   2012-07-20 10:28:59 upgrade kmail 4:4.8.4a-0ubuntu0.1 4:4.8.4a-0ubuntu0.3
   2012-07-20 10:28:59 status half-configured kmail 4:4.8.4a-0ubuntu0.1
   2012-07-20 10:28:59 status unpacked kmail 4:4.8.4a-0ubuntu0.1
   2012-07-20 10:28:59 status half-installed kmail 4:4.8.4a-0ubuntu0.1
   2012-07-20 10:28:59 status half-installed kmail 4:4.8.4a-0ubuntu0.1
   2012-07-20 10:28:59 status half-installed kmail 4:4.8.4a-0ubuntu0.1
   2012-07-20 10:29:02 status unpacked kmail 4:4.8.4a-0ubuntu0.3
   2012-07-20 10:29:02 status unpacked kmail 4:4.8.4a-0ubuntu0.3
   2012-07-20 10:29:21 configure kmail 4:4.8.4a-0ubuntu0.3 <keine>
   2012-07-20 10:29:21 status unpacked kmail 4:4.8.4a-0ubuntu0.3
   2012-07-20 10:29:21 status half-configured kmail 4:4.8.4a-0ubuntu0.3
   2012-07-20 10:29:24 status installed kmail 4:4.8.4a-0ubuntu0.3
   2012-07-20 10:32:27 status installed kmail 4:4.8.4a-0ubuntu0.3
   2012-07-20 10:32:27 remove kmail 4:4.8.4a-0ubuntu0.3 <keine>
   2012-07-20 10:32:27 status half-configured kmail 4:4.8.4a-0ubuntu0.3
   2012-07-20 10:32:27 status half-installed kmail 4:4.8.4a-0ubuntu0.3
   2012-07-20 10:32:27 status half-installed kmail 4:4.8.4a-0ubuntu0.3
   2012-07-20 10:32:30 status config-files kmail 4:4.8.4a-0ubuntu0.3
   2012-07-20 10:32:30 status config-files kmail 4:4.8.4a-0ubuntu0.3