I just installed a clean 10.10 64bit amd version and I am experiencing a similar issue where the Authentication dialog box hangs there after I enter my password and never continues on.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/670535 Title: Update manager's authentication request needs fixing -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs