System Restore to Last Known Sane Time
Thru this spec, Ubuntu will backup the system everytime an important configuration file was tweaked or a package was installed / upgraded (the "Windows Style", sorry to say) and restore the system upon request to the last known sane time.
Usage1: I install xgl. It borks my X but I do not remember what kind of tweaks I did. I hit "Restore System" under System > Administration and all is back
Usage2: An upgrade breaks my system and borks dpkg. I hit "System Restore" and my system is back.
Usage3: I will upgrade to Firefox2 using backports (imaginary). I hit "Create System Restore Point" worrying that it might break my good old Firefox.
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Note the similarity between this idea and:
As this feature will be mainly used in case of trouble, logging should be implemented, as suggested in: