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Saving package list with the "automatically installed" attribute

Is there any way to save the list of installed packages and have it 
include the attribute "automatically installed" used by aptitude? I know 
about dpkg --get-selections and --set-selection but they don't include 
the information used by aptitude.

And secondly, is it possible to somehow track packages with information 
like when they were installed/upgraded, from what previous version etc.. 
sort of like tracking changes to the system so that you can go back to a 
working state if you for some reason would want to. Or is all information 
about a previous state completely forgotten once the system has been 
upgraded? Isn't there even an application out there that can keep a 
history of changes to the package structure?

Olle Eriksson

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