Nicola Jelmorini, thank you for reporting this and helping make Ubuntu better.
However, your crash report is attached. Please follow these instructions to
have apport report a new bug about your crash that can be dealt with by the
automatic retracer. First, execute at a terminal:
cd /var/crash &
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: compiz (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1008701
Title:
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** Attachment added: "apport crash log file"
https://bugs.launchpad.net/bugs/1008701/+attachment/3175386/+files/_usr_bin_compiz.1000.crash
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Tit