http://ubuntuforums.org/showthread.php?t=1034438
xauth: /home/user/.Xauthority not writable, changes will be ignored
xauth: error in locking authority file /home/user/.Xauthority
xauth: error in locking authority file /home/user/.Xauthority
xauth: error in locking authority file /home/user/.Xauthority
X: user not authorized to run the X server, aborting.
xinit: Server error.
xauth: error in locking authority file /home/user/.Xauthority
とりあえず、下記を消して解決
$ ls /home/user/.Xauthority*
/home/user/.Xauthority /home/user/.Xauthority-c /home/user/.Xauthority-l
$ rm /home/user/.Xauthority*
ゴミが残っていたのか？、詳細は不明。
