[Bug 1925821] Re: do-release-upgrade 18 to 20 LTS failed

[Cliff Kotnik]

Per Brian's instructions of 5-14 I performed the upgrade with the "-p"
option.  The upgrade performed as expected and my system is now on
release 20.

thanks very much for the quick response.
Cliff

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https://bugs.launchpad.net/bugs/1925821

Title:
  do-release-upgrade 18 to 20 LTS failed

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

Bug description:
  I started the release upgrade.  It ran for a few minutes and then
  terminated with

  Calculating the changes
  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  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'.

  Restoring original system state
  Aborting

  I need help resolving this.
  Cliff

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.44
  ProcVersionSignature: Ubuntu 4.15.0-142.146-generic 4.15.18
  Uname: Linux 4.15.0-142-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  Date: Fri Apr 23 10:48:01 2021
  InstallationDate: Installed on 2012-05-16 (3263 days ago)
  InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Release amd64 (20120424.1)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-04-23 (0 days ago)

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