Give some more context of this problem. Like what else did you try to install besides GNOME.
that sources.list file was my own personal sources.list file and i had personally upgraded my gnome to 2.8.1 a month back.
one thing you can do to trouble shoot is to login to shell from CTRL + ALT + F1 and login as root. then add a new user using # adduser . Then try logging in from this user id.
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