Some weeks ago I had updated Ubuntu at the 11.10 version, but I had started having problems with QGIS 1.8: I installed the program and launched it, but it didn't open and crashed continuously.
I decided to update the operating system again, to the 12.04 version, but this hasn't solved the problems. So I've removed QGIS and all its related packages, in order to re-install it with the PPA from the website (for Precise):
deb http://qgis.org/debian precise main deb-src http://qgis.org/debian precise main
To add the the qgis.org repository public key to your apt keyring, type:
gpg --keyserver keyserver.ubuntu.com --recv 997D3880 gpg --export --armor 997D3880 | sudo apt-key add -
So the program is installed and it starts, but it creates an unstable window and often crashes: where is the problem?
I have two options: A) my laptop is over and unable to cope with GIS requirements B) there's something disturbing the GIS that lasts across the OS updatings.