tried
paul@paul-HP:~/Desktop$ sudo apt-get --reinstall install xorg
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reinstallation of xorg is not possible, it cannot be downloaded.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
tried HP:~/Desktop$ sudo apt-get --reinstall install xorg
paul@paul-
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reinstallation of xorg is not possible, it cannot be downloaded.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Any idea?