[Bug 2008141] Re: apt pattern to list packages from universe

[Julian Andres Klode]

You can only query '?section(^universe/)'

** Changed in: apt (Ubuntu)
   Importance: Undecided => Wishlist

** Changed in: apt (Ubuntu)
       Status: New => Triaged

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Title:
  apt pattern to list packages from universe

Status in apt package in Ubuntu:
  Triaged

Bug description:
  Hello, a friend would like to remove all universe packages from their
  system but I do not know an easy way to discover which installed
  packages came from universe. I expected one of these two apt patterns
  to work:

         ?archive(REGEX), ~AREGEX
             Selects versions that come from the archive that matches
             the specified regular expression. Archive, here, means
             the values after a= in apt-cache policy.

         ?origin(REGEX), ~OREGEX
             Selects versions that come from the origin that matches
             the specified regular expression. Origin, here, means the
             values after o= in apt-cache policy.

  However, a quick check of my own system's apt-cache policy output
  shows the a= and o= values aren't helpful for determining universe
  from main:

  $ apt-cache policy | grep -A1 universe
   500 http://security.ubuntu.com/ubuntu focal-security/universe amd64 Packages
       release v=20.04,o=Ubuntu,a=focal-security,n=focal,l=Ubuntu,c=universe,b=amd64
       origin security.ubuntu.com
  --
   400 http://192.168.0.27/ubuntu focal-proposed/universe amd64 Packages
       release v=20.04,o=Ubuntu,a=focal-proposed,n=focal,l=Ubuntu,c=universe,b=amd64
       origin 192.168.0.27
  --
   500 http://192.168.0.27/ubuntu focal-updates/universe amd64 Packages
       release v=20.04,o=Ubuntu,a=focal-updates,n=focal,l=Ubuntu,c=universe,b=amd64
       origin 192.168.0.27
  --
   500 http://192.168.0.27/ubuntu focal/universe amd64 Packages
       release v=20.04,o=Ubuntu,a=focal,n=focal,l=Ubuntu,c=universe,b=amd64
       origin 192.168.0.27

  Are there apt patterns that can select the c=universe state?

  Thanks

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