It looks like your user is not the sole owner of .Xauthority. Are you sure you did it right? just in case ->
cd /home/user mv .Xauthority .Xauthority.old touch .Xauthority chown user:user .Xauthority
It looks like your user is not the sole owner of .Xauthority. Are you sure you did it right? just in case ->
cd /home/user mv .Xauthority .Xauthority.old touch .Xauthority chown user:user .Xauthority