Thanks for your bug. Could you run "sudo sh -x /var/lib/dpkg/info/gnome-
session.prerm remove" and copy the log to a comment?
** Changed in: gnome-session (Ubuntu)
Assignee: (unassigned) => Ubuntu Desktop Bugs
Status: Unconfirmed => Needs Info
--
post-removal/install scripts keep failing
https://launchpad.net/bugs/66137