[Bug 1787668] Re: ubuntu-release-upgrader crashed with KeyError: "The cache has no package named 'ubuntu-desktop'"

[Frederik Hartmann]

The package 'ubuntu-desktop' doesn't exist for 16.04 on s390x where I encountered this error.
Adding a bionic repository to sources.list without upgrading works as a hacky workaround since this package exists in bionic and the failing check is simply a verification if this package is installed.

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https://bugs.launchpad.net/bugs/1787668

Title:
  ubuntu-release-upgrader crashed with KeyError: "The cache has no
  package named 'ubuntu-desktop'"

Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed

Bug description:
  The Ubuntu Error Tracker has been receiving reports about a problem regarding ubuntu-release-upgrader.  This problem was most recently seen with package version 1:18.04.24, the problem page at https://errors.ubuntu.com/problem/4d58e1d3013ef3d30087896474bb1a7328354e59 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
  If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.

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