It is not enough to remove the sources.list files from the
sources.list.d folder, you need to also install the official version of
the package you installed from the ppa. This can be done with the tool
ppa-purge from the package ppa-purge. Thanks!
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1791208
Title:
Fail to upgrade to 18.04LTS from 16.04LTS
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