OK, tried it and got some error messages.
Here is a captured contents of the directory /etc/X11

=======

marty@marty-laptop:~$ ls -l /etc/X11 > cont
marty@marty-laptop:~$ cat cont
total 72
drwxr-xr-x 2 root root 4096 2010-05-14 14:44 app-defaults
drwxr-xr-x 2 root root 4096 2010-04-29 07:27 cursors
-rw-r--r-- 1 root root 14 2010-04-29 07:28 default-display-manager
drwxr-xr-x 6 root root 4096 2010-04-29 07:25 fonts
-rw-r--r-- 1 root root 17394 2009-12-03 04:56 rgb.txt
lrwxrwxrwx 1 root root 13 2010-05-04 17:13 X -> /usr/bin/Xorg
drwxr-xr-x 3 root root 4096 2010-04-29 07:27 xinit
drwxr-xr-x 2 root root 4096 2010-04-15 07:12 xkb
-rwxr-xr-x 1 root root 709 2010-04-01 06:19 Xreset
drwxr-xr-x 2 root root 4096 2010-05-14 14:44 Xreset.d
drwxr-xr-x 2 root root 4096 2010-05-14 14:44 Xresources
-rwxr-xr-x 1 root root 3730 2010-04-01 06:07 Xsession
drwxr-xr-x 2 root root 4096 2010-05-14 14:44 Xsession.d
-rw-r--r-- 1 root root 265 2008-07-01 12:41 Xsession.options
-rw------- 1 root root 601 2010-04-29 07:20 Xwrapper.config
marty@marty-laptop:~$

==============

As I say entering the below command did nothing.
I suspect the package whatever it is, isn't completely installed.
What package can I remove and reinstall.