Public bug reported:

Cloud images ship with empty /var/lib/apt/lists/ to save on size.
Running 'ubuntu-bug <supported_package>' will erroneously report that
the package is unsupported:

  $ ubuntu-bug coreutils

  *** Collecting problem information

  The collected information can be sent to the developers to improve the
  application. This might take a few minutes.
  .

  *** Problem in coreutils

  The problem cannot be reported:

  This is not an official Ubuntu package. Please remove any third party
package and try again.

A simpler recreate is:

$ python3 -c 'import 
apport;print(apport.packaging.is_distro_package("coreutils"))'
False
$ sudo apt update -qq
All packages are up to date.
$ python3 -c 'import 
apport;print(apport.packaging.is_distro_package("coreutils"))'
True

Desired result:

The message should instruct the user to run 'apt update' as root if they
think this is in error.   That would improve usability and avoid false
reports about apport incorrectly flagging a package as unsupported.

Additionally, if the user is root (and optionally if the set of package
candidates only contains a 'now' component) self._cache.update();
self._cache.open() could be called to download lists.

** Affects: apport (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1775219

Title:
  incorrectly reports package as unsupported if apt cache is empty

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