I found out what it was - a bad flag inside a startup script. You may close this bug now.
** Changed in: xfce4-session (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1189061 Title: (13.04) XFCE session seemingly terminates at random (Installed: 4.10.0-2ubuntu1) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xfce4-session/+bug/1189061/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs