Removing gnome-shell ...
Removing evolution-data-server ...
Purging configuration files for evolution-data-server ...
Removing gdm ...
Purging configuration files for gdm ...
Removing user `gdm' ...
Warning: group `gdm' has no more members.
userdel: user gdm is currently used by process 1567
/usr/sbin/deluser: `/usr/sbin/userdel gdm' returned error code 8. Exiting.
Could not remove gdm user.
/usr/sbin/delgroup: `gdm' still has `gdm' as their primary group!
Could not remove gdm group.
userdel: user gdm is currently used by process 1567
/usr/sbin/deluser: `/usr/sbin/userdel gdm' returned error code 8. Exiting.
/usr/sbin/delgroup: `gdm' still has `gdm' as their primary group!
dpkg: error processing gdm (--purge):
 subprocess installed post-removal script returned error exit status 128