[Bug 1923256] Re: Unable to Upgrade from 18.04 to 20.04

[Brian Murray]

*** This bug is a duplicate of bug 1928397 ***
    https://bugs.launchpad.net/bugs/1928397

The version of the release upgrade code has moved from -proposed to
-updates so you ended up using the new version anyway. Thanks for your
willingness to help though!

** This bug has been marked a duplicate of bug 1928397
   ensure python is marked for removal when upgrading from 18.04 to 20.04

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https://bugs.launchpad.net/bugs/1923256

Title:
  Unable to Upgrade from 18.04 to 20.04

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

Bug description:
  Trying to upgrade from 18.04 to 20.04. Machine was off for the last 2
  years.

  An unresolvable problem occurred while calculating the upgrade.

  This was likely caused by: 
  * Unofficial software packages not provided by Ubuntu 
  Please use the tool 'ppa-purge' from the ppa-purge 
  package to remove software from a Launchpad PPA and 
  try the upgrade again. 

  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If 
  you want to investigate this yourself the log files in 
  '/var/log/dist-upgrade' will contain details about the upgrade. 
  Specifically, look at 'main.log' and 'apt.log'. 

  In main.log and apt.log I only get:

  sudo ack "ERROR Dist-upgrade"  /var/log/dist-upgrade
  /var/log/dist-upgrade/20210409-2136/main.log
  123:2021-04-09 21:32:27,108 ERROR Dist-upgrade failed: 'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'

  /var/log/dist-upgrade/main.log
  116:2021-04-09 21:57:40,820 ERROR Dist-upgrade failed: 'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'

  /var/log/dist-upgrade/20210409-2156/main.log
  115:2021-04-09 21:45:52,083 ERROR Dist-upgrade failed: 'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'

  /var/log/dist-upgrade/20210409-2144/main.log
  115:2021-04-09 21:38:20,080 ERROR Dist-upgrade failed: 'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'

  
  I have no held packages, and there are no packages to upgrade. 

  sudo apt upgrade 
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Calculating upgrade... Done
  0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

  apt-mark showhold gives nothing.

  I'm at a loss...

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.42
  ProcVersionSignature: Ubuntu 4.15.0-140.144-generic 4.15.18
  Uname: Linux 4.15.0-140-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Apr  9 21:58:11 2021
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-04-09 (0 days ago)

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