I though that doing:
sudo apt-add-repository ppa:xorg-edgers/ppa sudo apt-get update sudo apt-get upgrade
It will fix my really SLOW interface using Unity in Oneiric...
Now, where I found this "solution", says that if something goes wrong I would have to put:
sudo ppa-purge xorg-edgers
But after that console says
sudo: ppa-purge: command not found
And if I have no solution for this, what would you recommend me to use for a faster interface?
You will need to install ppa-purge if it hasn't already been installed:
sudo apt-get install ppa-purge
The usual syntax to use this is
sudo ppa-purge ppa:[foo]
where [foo] is the PPA to remove.
Thus for the xorg-edgers PPA you should use
sudo ppa-purge ppa:xorg-edgers/ppa
As to your general graphical issues with edgers - you should read their front-page
It makes it clear that the PPA is highly unstable.
Some people have found that installing the proprietary drivers resolves slow/laggy windows. If you want help with this look for a question with the model of your graphics card - and if you cannot find one, create another question.
One of the comments in this question (slightly newer version of your 9200) - if correct - indicates that you might have to stick with the opensource drivers that are installed by default.
If this is the case - using Unity 2D (logout and change the session) might be a better bet to resolve your laggy graphics issues.
To find the exact model name of your graphics card - in a terminal type:
lspci | grep VGA
