[Bug 1896384] Re: Error upgrading distro

[Daniel Letzeisen]

"There are no errors shown in main.log"
Look again:
2020-09-20 14:56:32,417 ERROR Dist-upgrade failed: 'E:Unable to correct problems, you have held broken packages.'

This is caused by having 3rd party PPA's and repositories installed (look at your /etc/apt/sources.list.d directory). It looks like the oibaf PPA specifically is causing the issue, so:
sudo apt-get install ppa-purge
sudo ppa-purge ppa:oibaf/graphics-drivers

I recommend you do the same with other bionic PPA's you have installed,
and also remove the old .list files (ones from xenial and debian
stable).

After you clean up your sources, try upgrading again. Please let us know
whether upgrade succeeds or fails.

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

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https://bugs.launchpad.net/bugs/1896384

Title:
  Error upgrading distro

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

Bug description:
  Trying to update system from 18.04 to 20.04 get error

  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'. 

  
  There are no errors shown in main.log

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-117.118-generic 4.15.18
  Uname: Linux 4.15.0-117-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Sep 20 14:57:04 2020
  InstallationDate: Installed on 2017-01-11 (1348 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: dist-upgrade
  UpgradeStatus: Upgraded to bionic on 2020-09-20 (0 days ago)

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