How To Downgrade To Compiz 0.8.6 In Ubuntu 11.04 Natty Narwhal

If you're using Ubuntu 11.04 with the classic Ubuntu desktop (no Unity), you've probably noticed that not all Compiz plugins work as they used to in Ubuntu 10.10 and changing some of the default Compiz settings results in quite a few bugs. This can be solved by downgrading Compiz to version 0.8.6 (Compiz from Ubuntu 10.10).
Further more, downgrading Compiz will also give you the notification area (systray) back, without having to whitelist applications and without the bug that occurs sometimes when whitelisting the systray (which prevents you from clicking certain AppIndicators).