Well, I don't know if this is the same for everyone, but I found the culprit on my machine. I added some debug statements inside of /etc/gdm/Xsession to figure out how the session was loaded and that led me to the directory
/etc/X11/Xsession.d/70fglrx_32bit_dri When the file inside got sourced by Xsession, it crashed things. dpkg stated that this directory wasn't owned by any package so I moved it out of /etc/X11/Xession.d and now I'm logging in just fine. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/663135 Title: gdm broken after update to 10.10 - instant session end - signal 15 - after login -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs