Comment 53 for bug 116193

I reexamined this (with America/Argentina/Buenos_Aires as timezone):

- An upgrade from feisty final (2007b-0ubuntu1) to gutsy final (2007f-3ubuntu1) produces the "post-installation script returned error exit status 10" bug.
- A further upgrade from that broken system to current gutsy-updates (2007h-0ubuntu0.7.10) repairs it and makes it work again, but leaves time zone as "user defined"
- A direct upgrade from feisty final (2007b-0ubuntu1) to gutsy-updates (2007h-0ubuntu0.7.10) works and has the same "user defined" time zone glitch.

Thus the current versions at least do not break upgrades. If your system currently does not upgrade because you caught an intermediate bad version, I am afraid you have to fix this manually by running "sudo tzconfig" in a terminal window.

I'll try to fix the remaining issue of setting the time zone to "user defined" on upgrade.