[Bug 1898467] Re: "Could not calculate the upgrade" error while upgrading from 18.04 to 20.04.1

[Brian Murray]

*** This bug is a duplicate of bug 1069133 ***
    https://bugs.launchpad.net/bugs/1069133

Reviewing the files from your upgrade attempt you seem to have enabled a
PPA that provides Xorg packages. This will prevent the upgrade as that
PPA contains package version numbers greater than the release to which
you are upgrading. You can revert the PPA by installing the ppa-purge
package from the official Ubuntu archive and then running 'sudo ppa-
purge ppa:kisak/kisak-mesa'.  After that you can try upgrading again and
if it still fails open a new bug report.  Thanks and good luck!

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

** Tags added: ppa xorg-kisak-ppa

** This bug has been marked a duplicate of bug 1069133
   Get upgrade error 12.04 - 12.10 "Could not determine upgrade" - xorg from ppa

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https://bugs.launchpad.net/bugs/1898467

Title:
  "Could not calculate the upgrade" error while upgrading from 18.04 to
  20.04.1

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

Bug description:
  I was trying to upgrade from Ubuntu 18.04 to 20.04.1 . I installed the
  latest software updates as recommended. I started the upgrade process
  but keep getting this error

  "Could not calculate the upgrade

  This was likely caused by:
  *Unoffocial software packages not provided by Ubuntu."

  It recommended the usage of ppa-purge. I installed that command package.
  Then I used the command " grep Broken /var/log/dist-upgrade/apt.log" to get the list of the programs that might need to get purged. But I got a list of hundreds of programs. Now I am confused about what to do. How do I find which ppa to purge or which program to remove?

  I just started using Ubuntu so don't know anything about how all of
  this works. Can you help me out?

  Thank you

  1) Ubuntu 18.04.5 LTS
  2) 
  3) Expected an upgrade from 18.04.5 to 20.04.1
  4) The upgrade did not complete due to some error.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.39
  ProcVersionSignature: Ubuntu 5.4.0-49.53~18.04.1-generic 5.4.65
  Uname: Linux 5.4.0-49-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.18
  Architecture: amd64
  CrashDB: ubuntu
  Date: Sun Oct  4 20:59:39 2020
  InstallationDate: Installed on 2020-04-04 (183 days ago)
  InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_IN:en
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_IN
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-04 (0 days ago)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update-manager.release-upgrades: 2020-10-04T17:33:12.039655

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