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Suppongo però che debba prima disinstallare Beryl..

E'' sufficiete cercare Beryl ed Emerald su Synaptic e rimuoverli?..

Altro problema: attualmente ho i driver ATI proprietari, ho letto che per fare funzionare compiz mi servono i driver opensource.. Come disinstallare i driver proprietari per installare gli opensource?

Installando Beryl ho creato una nuova sessione "GLX".. Va rimossa anche quella?..

tommaso ha scritto:
puoi tenerli entrambi avviando quando vuoi uno dei due

  Compiz 0.5 on Feisty

Alternatively, you can install some experimental Compiz 0.5 packages from the following repository. Please note these packages ARE experimental, and unless you are an experienced Compiz user, you aren't recommended to use them yet:

deb http://ubuntu.moshen.de feisty eyecandy

Once you've added that repository, run the following command:

sudo apt-get remove compiz-extra

Now, you may either run "gconftool-2 --recursive-unset /apps/compiz" or manually make sure none of the "compiz-extra" plugins are loaded in "/apps/compiz/general/allscreens/options/active_plugins".

Next, run these commands:

wget http://ubuntu.moshen.de/2F306651.gpg -O- | sudo apt-key add -
sudo apt-get update; sudo apt-get dist-upgrade

Log out, and log back in. You should now be able to start Compiz.

Please note that it may (and probably) won't start automatically for the time being as the packages are missing a special "wrapper" script that makes launching Compiz simpler. Similarly, the packages are missing the keybinding plugin.