I had this problem, and it turned out I had chown'ed /etc/shadow as root:root instead of root:shadow. I was really confused because my password worked fine for logging in normally and for ssh, but just not for the screensaver.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/270781 Title: unix_chkpwd abnormal exit: 11 unix_chkpwd crashes under gnome- screensaver and prevents unlock (/dev/null corruption?) -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
