I can confirm this issue in Lucid. I got this "checking-lock" several times and if I remember correctly, for me it actually happened only after a suspend (closing the lid).
It's possible to switch to the console and kill gnome-screensaver- dialog. Afterwards, a login with the login-dialog works without problems. $ lsb_release -rd Description: Ubuntu 10.04 LTS Release: 10.04 $ apt-cache policy gnome-screensaver gnome-screensaver: Installiert: 2.30.0-0ubuntu2 Kandidat: 2.30.0-0ubuntu2 Versions-Tabelle: *** 2.30.0-0ubuntu2 0 900 http://ubuntu.inode.at/ubuntu/ lucid-updates/main Packages 100 /var/lib/dpkg/status 2.30.0-0ubuntu1 0 500 http://ubuntu.inode.at/ubuntu/ lucid/main Packages ** Changed in: gnome-screensaver (Ubuntu) Status: New => Confirmed -- logging in after suspend sometimes hangs https://bugs.launchpad.net/bugs/488891 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-screensaver in ubuntu. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs