There is an upstart logrotate job that runs automatically soon after session start, however, it does not (yet) run periodically to handle rogue jobs such as gnome-session. You can however run the job yourself simply enough as a non-root user:
$ start logrotate Please attach a few lines of the output from your gnome-session log. ** Package changed: upstart (Ubuntu) => gnome-session (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-session in Ubuntu. https://bugs.launchpad.net/bugs/1269838 Title: gnome-session.log takes 8 GB in a few hours To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-session/+bug/1269838/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs