upgrade from 18.04 to 20.04 fails

[Andrew Jennings]

When attempting a distribution upgrade from 18.04 to 20.04, the upgrade fails and returns the following message:

Could not determine the upgrade

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'.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 4.15.0-112.113-generic 4.15.18
Uname: Linux 4.15.0-112-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.16
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Wed Aug 26 13:13:17 2020
InstallationDate: Installed on 2018-08-27 (729 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-08-26 (0 days ago)
VarLogDistupgradeTermlog:

mtime.conffile..etc.update-manager.release-upgrades: 2020-08-15T23:06:29.700204

[Daniel Letzeisen (dtl131)]

From logs, it looks like you have the "oibaf" PPA enabled and it is causing conflicts. Make sure you remove it (and other PPA's you may have enabled:
sudo ppa-purge ppa:oibaf/graphics-drivers

[Andrew Jennings (patslap)]

Thank you for your email - I was misinterpreting the logs; I thought it was
an issue caused by python 2.

On Fri, 28 Aug 2020, 03:50 Daniel Letzeisen, <email address hidden>
wrote:

> >From logs, it looks like you have the "oibaf" PPA enabled and it is
> causing conflicts. Make sure you remove it (and other PPA's you may have
> enabled:
> sudo ppa-purge ppa:oibaf/graphics-drivers
>
> ** Changed in: ubuntu-release-upgrader (Ubuntu)
> Status: New => Incomplete
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1893043
>
> Title:
> upgrade from 18.04 to 20.04 fails
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1893043/+subscriptions
>

[Brian Murray (brian-murray)]

Well its caused by the xorg drivers and python2 which both come from that PPA.

[Brian Murray (brian-murray)]

Reviewing the files from your upgrade attempt you seem to have enabled a PPA that provides Xorg and python packages. This will prevent the upgrade as that PPA contains packages which generate failures when trying to calculate the upgrade. 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!

[Andrew Jennings (patslap)]

The purge your recommended worked, many thanks :)

On Fri, 18 Sep 2020, 20:45 Brian Murray, <email address hidden> wrote:

> Reviewing the files from your upgrade attempt you seem to have enabled a
> PPA that provides Xorg and python packages. This will prevent the
> upgrade as that PPA contains packages which generate failures when
> trying to calculate the upgrade. 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!
>
> ** Tags added: ppa xorg-oibaf-ppa
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1893043
>
> Title:
> upgrade from 18.04 to 20.04 fails
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1893043/+subscriptions
>