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In some cases Gnome will no longer let a user login because there are some lockfiles that weren't removed the last time the user logged out. These files are:
Just remove these files and the login error should go away. If not, most likely the account is over quota, which can be checked with the command 'quota -v' If the account is over quota, files will also need to be removed before the user can log back in. The "Failsafe Xterm" session option that can be chosen from "Sessions" at the login screen can be used to get access to an xterm while the account is broken.
Otherwise, contact the Systems Operator for assitance removing the lockfiles.