Hi,
Please read the instructions regarding your PPA drivers and upgrading at
https://launchpad.net/~oibaf/+archive/ubuntu/graphics-drivers
Especially these two paragraphs:
=== Upgrading to a newer Ubuntu ===
It is *strongly* suggested to remove all packages from this PPA before updating
to a newer Ubuntu release. See the section "Revert to original drivers" later
on.
Then, after the upgrade, you can add again this PPA.
=== Revert to original drivers ===
To revert to standard Ubuntu drivers type the following in a prompt shell:
$ sudo apt-get install ppa-purge
$ sudo ppa-purge ppa:oibaf/graphics-drivers
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1807024
Title:
bug ubuntu 18.04
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