How to reset things to their default, post-installation state?

[Mihamina Rakotomandimby]

>> are different?  Basically, I am looking for something like 
>> $ apt-get dist-verify  
> No such command.

Could you please read before answering?

He looks for something that doesnt exist, yes, but if it existed, the
right name would be "dist-verify". The he explains the features he
wants.

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