I believe that this may have happened to me with ppa:oibaf/graphics-
drivers
$ sudo ppa-purge ppa:oibaf/graphics-drivers
Updating packages lists
PPA to be removed: oibaf graphics-drivers
Warning: Could not find package list for PPA: oibaf graphics-drivers
$
In this case, the ppa exists for newer releases of ubuntu but the
support for bionic has been removed. In any case, I am stuck with
packages that were installed via the ppa but I have no way to revert
them to official package types. This seems to prevent do-release-
upgrade from completing.
See also:
https://answers.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+question/696223
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1920829
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1069133
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https://bugs.launchpad.net/bugs/1855681
Title:
Cannot purge a removed ppa
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