This may apply if you're trying to upgrade.
Quote:X11 and older releases
When upgrading from older releases, some users have reported issues with X11 no longer starting. If you are upgrading an older (i.e. 0.5.x) release with a desktop environment, before rebooting the system it is advisable that you run the following command:
sudo apt-get install xserver-xorg-video-armsoc
You may also want to check the contents of the /etc/X11/xorg.conf.d/ directory, and if 20-modesetting.conf is present, move or rename it. i.e. sudo mv /etc/X11/xorg.conf.d/20-modesetting.conf /etc/X11/xorg.conf.d/20-modesetting.disabled
If you don't do this, there is a chance that X11 will crash on next boot, and you'll need to login to your system using a serial console or via SSH, and run the above commands. You should then be able to reboot your system and be greeted with a working X11 install again!
