I had the exact same problem and did the steps in comment #3 with the exact same results.
So, I tried: sudo dpkg-reconfigure lightdm That appeared to resolve the problem once I switched the default display manager back to lightdm. After that I was able to do: sudo apt-get purge gdm And I did not have any problems getting to the login screen with lightdm after that. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/856810 Title: Boot hangs at "Booting system without full network configuration..." To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/netcfg/+bug/856810/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs