The purge your recommended worked, many thanks :)

On Fri, 18 Sep 2020, 20:45 Brian Murray, <[email protected]>
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
>

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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

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