[Bug 1787649] Re: ubuntu-release-upgrader crashed with SystemError: E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

[Brian Murray]

I also upgraded an Ubuntu 16.04 system with ubuntu-server installed
using release-upgrader version 18.04.26 to Ubuntu 18.04 and there were
no issues.

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https://bugs.launchpad.net/bugs/1787649

Title:
  ubuntu-release-upgrader crashed with SystemError: E:Error,
  pkgProblemResolver::Resolve generated breaks, this may be caused by
  held packages.

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Bionic:
  Fix Committed

Bug description:
  [Impact]
  As documented in bug 1766890 some system were having failing to upgrade due to trigger issues with gnome-menus and ubuntu-release-upgrader was modified to upgrade libc6 first because that would fix that. However, in some rare cases this causes an issue for apt's problem resolver and the upgrade can't be calculated. Instead of leaving people on an unsupported we should try and upgrade them the way we used to - by not upgrading libc6 first.

  [Test Case]
  We actually haven't found a situation where upgrading libc6 first will create a issue for apt's problem resolver, but testing upgrades to ensure there are no regressions should be sufficient. Additionally, we can watch the bucket in the Ubuntu Error Tracker (referenced below) to ensure that the new version of ubuntu-release-upgrader doesn't appear there.

  [Regression Potential]
  A typo in the new code could cause a different Traceback, but it all looks good to me.

  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/2295855a1a01cc3182184b45e474b7af0ea7f46b 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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