Comment 15 for bug 1867375

> Please, forgive my ignorance, but how do I return to normal official packages, after I remove your PPA? Because "apt update" doesn't detect any changes. after "add-apt-repository --remove ppa:ddstreet/systemd".

once the next (fixed) systemd version is released, it will have a higher version number than the build from my ppa, and you can upgrade to the official version simply by 'sudo apt update ; sudo apt upgrade'. Make sure not to continue using my PPA, of course, but running the --remove command you did should be all that's needed to remove it.

If you want to revert to the official package version before the next version is released, you can manually specify the older package version to apt, like 'sudo apt install systemd=245.4-4ubuntu3'. You will also need to specify all related packages (e.g. udev, libsystemd0, libudev1, etc...) with the older version number.