Comment 35 for bug 772612

I have deleted the package in the ppa as I can also confirm the issue as described by Franck. (previously I did not had access to Natty).

If you installed from the ppa and are facing the start-up problem then login to classic desktop, disable my ppa in software-sources and run the following command in terminal.

sudo apt-get install compiz/natty compiz-core/natty compiz-gnome/natty compiz-plugins/natty libdecoration0/natty