[Bug 1894967] Re: Upgrade from bionic LTS to focal LTS fails because of "pkgProblemResolver::Resolve generated breaks"

[Bernd Porr]

do-release-upgrade still doesn't work.

Workaround (the Debian way):

sed -i 's/bionic/focal/g' /etc/apt/sources.list
apt update
apt -y dist-upgrade
grub-install

... which works perfectly.

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https://bugs.launchpad.net/bugs/1894967

Title:
  Upgrade from bionic LTS to focal LTS fails because of
  "pkgProblemResolver::Resolve generated breaks"

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

Bug description:
  main.log gives this error:

  2020-09-09 10:15:03,237 ERROR Dist-upgrade failed: 'E:Error,
  pkgProblemResolver::Resolve generated breaks, this may be caused by
  held packages.'

  however, there is no hint in the log files what that might be. I have
  a few PPAs but none of them are flagged up in the log files. Neither
  apt.log nor mail.log.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 5.4.0-47.51~18.04.1-generic 5.4.55
  Uname: Linux 5.4.0-47-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Sep  9 10:18:29 2020
  InstallationDate: Installed on 2014-08-18 (2213 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-09-09 (0 days ago)

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