[Bug 1936174] Re: I have tried multiple times to upgrade from 18.04 to 20.04 but it fails everytime

[Chris Guiver]

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


Thank you for taking the time to report this bug and helping to make
Ubuntu better.

I see a number of 3rd party packages, esp. from
https://launchpad.net/~oibaf/+ppa-packages

For best results with a release-upgrade, you should remove all 3rd party
packages (bringing your system back to a pure Ubuntu one, ie. no 3rd
party packages) then perform the upgrade. The tool ppa-purge can assist
with this.

Likely related to https://bugs.launchpad.net/ubuntu/+source/ubuntu-
release-upgrader/+bug/1069133

(following from https://bugs.launchpad.net/ubuntu/+source/ubuntu-
release-upgrader/+bug/1922546/comments/2)

[The use of oibaf ppa] 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:oibaf/graphics-drivers'. After that you can try upgrading again and
if it still fails open a new bug report. Thanks and good luck!


** 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/1936174

Title:
  I have tried multiple times to upgrade from 18.04 to 20.04 but it
  fails everytime

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

Bug description:
  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  This was caused by: 
  * Upgrading to a pre-release version of Ubuntu 
  This is most likely a transient problem, 
  please try again later. 
  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'.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.44
  ProcVersionSignature: Ubuntu 4.15.0-51.55-generic 4.15.18
  Uname: Linux 4.15.0-51-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.24
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Jul 14 12:24:46 2021
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-07-14 (0 days ago)

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