do-release-upgrade -d fails

[Jan Walter]

1)
Description: Ubuntu 18.04.5 LTS
Release: 18.04
2) Following answer here: https://askubuntu.com/questions/1231817/invalid-package-information-error-when-upgrading-to-ubuntu-20-04
3) Upgrade from Ubuntu 18.04 to Ubuntu 20.04
4) Aborting

$ sudo do-release-upgrade
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [1.554 B]
Get:2 Upgrade tool [1.341 kB]
Fetched 1.343 kB in 0s (0 B/s)
authenticate 'focal.tar.gz' against 'focal.tar.gz.gpg'
extracting 'focal.tar.gz'

Reading cache

Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Hit http://de.archive.ubuntu.com/ubuntu bionic InRelease
Hit http://de.archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit http://de.archive.ubuntu.com/ubuntu bionic-security InRelease
Hit http://de.archive.ubuntu.com/ubuntu bionic-backports InRelease
Fetched 0 B in 0s (0 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done

Updating repository information
Hit http://de.archive.ubuntu.com/ubuntu focal InRelease
Hit http://de.archive.ubuntu.com/ubuntu focal-updates InRelease
Hit http://de.archive.ubuntu.com/ubuntu focal-security InRelease
Hit http://de.archive.ubuntu.com/ubuntu focal-backports InRelease
Fetched 0 B 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
$ grep ERROR /var/log/dist-upgrade/main.log
2021-01-27 13:29:01,718 ERROR Dist-upgrade failed: 'E:Unable to correct problems, you have held broken packages.'

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.42
ProcVersionSignature: Ubuntu 4.15.0-135.139-generic 4.15.18
Uname: Linux 4.15.0-135-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.21
Architecture: amd64
CrashDB: ubuntu
Date: Wed Jan 27 13:26:58 2021
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2021-01-27 (0 days ago)

[Brian Murray (brian-murray)]

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