[Bug 1927680] Re: Release 18.04.5 LTS. Could not calculate the upgrade. An unresolvable occureed while calculating the changes.

[Brian Murray]

Thanks for taking the time to report this upgrade failure. There is
currently a new version of the release upgrader available in -proposed
which may resolve the error you've encountered. Please run the following
command to test the new version of the upgrader:

  do-release-upgrade -p

Please lets us know the results in this bug report. Thanks again and
good luck!

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

** Tags added: lp-1928397

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https://bugs.launchpad.net/bugs/1927680

Title:
  Release 18.04.5 LTS. Could not calculate the upgrade. An unresolvable
  occureed while calculating the changes.

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

Bug description:
  Updating repository information
  Hit http://azure.archive.ubuntu.com/ubuntu focal InRelease
  Get:1 http://azure.archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
  Get:2 http://azure.archive.ubuntu.com/ubuntu focal-backports InRelease [101 kB]
  Hit http://security.ubuntu.com/ubuntu focal-security InRelease
  Hit https://esm.ubuntu.com/infra/ubuntu focal-infra-security InRelease
  Hit https://esm.ubuntu.com/infra/ubuntu focal-infra-updates InRelease
  Fetched 214 kB in 0s (0 B/s)

  Checking package manager
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done

  Calculating the changes

  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
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  === Command detached from window (Fri May  7 05:50:11 2021) ===

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.44
  ProcVersionSignature: Ubuntu 5.4.0-1046.48~18.04.1-azure 5.4.101
  Uname: Linux 5.4.0-1046-azure x86_64
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  Date: Fri May  7 05:39:54 2021
  PackageArchitecture: all
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-05-07 (0 days ago)
  VarLogDistupgradeLspcitxt:

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