I use ubuntu 14.04 on Asus X552CL. (i3/4GB ram/1.8Ghz/1GB graphic card).
I didn’t face this problem earlier. However, it started occurring frequently since this week.
Major changes that I did this week are:
Install proprietary Nvidia graphic card. And play around wih compiz and emerald in order to install new themes.
I don’t know what’s causing this problem. The OS freezes abruptly and frequently- keyboard and mouse doesn’t respond. I have two options then: to force shutdown by hard pressing the power button for few secs, or switch into tty mode using ctrl + alt+ f1 (any of the function keys from f1 to f6). When I switch back to gui mode using f7, the OS unfreezes. But since this is happening very frequently, I need to solve it as soon as possible.
Answer
DO NOT FOLLOW ANY ADVICE TO DELETE COMPIZ!
I had the same problem after tweaking compiz. Unfortunately I followed someone’s advice to delete compiz and destroyed my installation. The solution I found was to install Ubuntu again. When I chose LVM to look at the layout, it wiped my drive without warning. It is the only option that does not give a warning once you have continued after checking it.
If you originally partitioned the /home on a separate drive, I have been told you can select the same partition for /home on the new install without losing the current data and settings. However, you may have some tweaking to do to get some apps to cooperate.
Attribution
Source : Link , Question Author : Faiz , Answer Author : Buck
