You'll want to use the tool ppa-purge from the package ppa-purge to
remove the PPAs you have enabled and revert back to the official
versions of the package which the PPAs provide. Here's an example from
the man page.
sudo ppa-purge -o sarvatt -p xorg-testing
will remove https://launchpad.net/~sarvatt/+archive/xorg-testing
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
** Summary changed:
- Can’t upgrade from 14.04 to 16.04
+ Can’t upgrade from 14.04 to 16.04 with PPAs enabled
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https://bugs.launchpad.net/bugs/1825564
Title:
Can’t upgrade from 14.04 to 16.04 with PPAs enabled
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