Starting from Ubuntu 12.04 we observed different graphics problems with “old” computers. When I say “old” I don’t mean obsolete hardware but PC with not more than three years of usage.
Many problems were especially noticed in systems with dual monitors or involving laptops. In few words, Ubuntu was not able to keep and memorize the correct video settings and it was necessary to set-up monitors configuration almost each time you logged on your OS. If you have the same problem and you are surfing the net to fix this “bug” don’t forget to search for solutions strictly connected to the laptop or graphic card you are really using. In fact in our experience there are more than few solutions possible and what it’s resolving for some hardware could become a real mess for different (but similar) machines.
The risk of damaging Ubuntu graphical interface while you try to fix the laptop – dual monitors problem is high. Or it has been in our experience because after some tests we were just able to use Ubuntu through the old line way in its safe mode boot. In any way, in our experience (IBM Thinkpad T43 and a HP L1950g monitor using Ubuntu 12.04 LTS with MATE as graphical interface) we solved all the matter just using Terminal and typing:
sudo apt-get update
and
sudo apt-get install ubuntu-desktop
We are not able to explain why it works but it really fixed the bug. Probably, in one of the previous update one or more libraries conflicted with Ubuntu 12.04 configuration generating all the mess we fought against during the past months.
So, if you want to test our solution on your PC, do it at your risk, and type:
sudo apt-get install --reinstall ubuntu-desktop
or
sudo apt-get install --reinstall xubuntu-desktop
or
sudo apt-get install --reinstall kubuntu-desktop
or
sudo apt-get install --reinstall lubuntu-desktop
If you want to reinstall all (k)ubuntu-desktop dependencies:
sudo apt-cache depends ubuntu-desktop | awk -F ":" '{print $2}' | sed '/^$/d' | xargs sudo apt-get install --reinstall --install-recommends --yes
Don’t forget to choose your favourite k-x-l-u-buntu-desktop when you type all the above code in just one line and !
Good luck!…. and touch wood while you fix this really annoying bug….. 
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