Thanks for your bugreport. Reading your bugreport I assume you didn't upgrade using "update-manager -c -d" but you used apt-get? The recommended way for gui users is using upgdate-manager because it will avoid this kind of problem.
To get your system back, try $ sudo apt-get install ubuntu-desktop^ and let me know if it brings back the system for you. Cheers, Michael ** Changed in: update-manager (Ubuntu) Status: Unconfirmed => Needs Info -- GDM Uninstalled on Upgrade https://launchpad.net/bugs/67069 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs