It seems to me that X server is corrupted on my Linux installation. I am using Ubuntu Linux and Xserver is acting strange restarting from time to time (usually when movie is playing). I would like to fix it but fear that it is to much for my limited knowledge so is there any way to reinstall X server.
I think you will have to reconfigure X server only and not to reinstall it completely. What ever, both operations are quite easy under Ubuntu. If you want to try reconfiguring it first then back-up etc/X11/xorg.conf and execute as root next command dpkg-reconfigure xserver-xorg (without the quotes, of course). As for reinstalling it is also one line job. Write as root or by using sudo command following : apt-get install --reinstall xserver-xorg. It will uninstall old Xserver, get new Xserver from repositories and install it.