[Bug 1734104] Re: 'upgrade' in bionic should by default autoremove as well

[Julian Andres Klode]

Oh right, that's another use case I forgot about. I can see cleaning
them up automatically in unattended-upgrades and dist-upgrade (or well,
when any new kernel is installed). I just don't want to accidentally
autoremove a desktop or something :)

I guess in essence we can just define a second level of autoremove that
only removes safe packages, and just enable that by default. This way we
can mark kernels as safe to autoremove, and still have an autoremove
command that removes potentially less-safe unused packages. We can even
extend that to other packages as needed.

Together with fixes for gnome-software and complete autoremove in do-
release-upgrade (and perhaps the limited autoremove when removing a
package) we should should have a solution that should not cause any big
issues I think.

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https://bugs.launchpad.net/bugs/1734104

Title:
  'upgrade' in bionic should by default autoremove as well

Status in apt package in Ubuntu:
  New

Bug description:
  In bionic, apt upgrade should also autoremove by default. I have a few
  bionic systems (upgrades from xenial mostly) which are not yet showing
  that behaviour, it may be we haven't implemented that yet so this is
  just a placeholder bug in that case :)

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