Comment 16 for bug 961611

That's hard to do... but I will try when it happens. But I do still have the crash report which contains:
 Uid: 120 120 120 120
which matches:
~$ getent passwd landscape
landscape:x:120:129::/var/lib/landscape:/bin/false

Of course the default Gid is landscape...

But I really really really believe this is the apt bug I described.

See:
https://bugs.launchpad.net/ubuntu/+source/apt/+bug/852003
https://bugs.launchpad.net/ubuntu/+source/python-apt/+bug/852003
https://bugs.launchpad.net/ubuntu-tweak/+bug/856140
https://bugs.launchpad.net/ubuntu-tweak/+bug/856144
https://bugs.launchpad.net/ubuntu-tweak/+bug/923967
https://bugs.launchpad.net/ubuntu/+source/synaptic/+bug/426191
https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/258909