Comment 30 for bug 572617

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Travis Watkins (amaranth) wrote : Re: [regression-release] Compiz fails to decorate windows after upgrade

Right, so what happens is you saved your session in karmic and that saved "compiz.real" as a program to run in your session. In lucid compiz.real doesn't exist so gnome-session tries to start it and fails. Ideally gnome-session would then just start the default WM ("compiz") but it does not. That's why a workaround is to either remove your saved session file or get compiz running then save your session again.