Public bug reported:
Binary package hint: apt
It is impossible for the apt user (or using any of its interfaces) to
list all the user installed packages. By user installed packages I mean
all packages manually installed and not on the basic system
installation.
** Affects: apt (Ubuntu)
Importance: Undecided
Status: Unconfirmed
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Impossible to list only user installed packages
https://launchpad.net/bugs/90228
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