Hello I'm having a problem that I can't seem to figure out why it's happening. I am a windows 7 user and recently moved to Ubuntu Mate 64bit. Every now and then the system freezes for no reason and show a blurred/pixelated screen. There is no particular software or process that causes this. I'm running Mate Desktop environment 1.12.1
I’ve had this happen a couple of times in virtual machines with various Linux distros…
I’m really not sure what causes it… It could be a graphics card / driver problem.
Have you checked the driver manager to see if there is a driver available for your video card? You can get there in the menu under System > Preferences > Hardware > Additional Drivers.
Best of Luck,
Jay