Tested this and yes, the loopback is up and working. Happens both for me (running NetworkManager) and my sister (using the usual Ubuntu network tools).
** Changed in: gnome-session (Ubuntu) Status: Needs Info => Confirmed -- Unable to start applications after hibernation https://launchpad.net/bugs/49221 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs