(Specific, upstream-provided) PPAs are the main reason I use Ubuntu Server. Given that they're built against Ubuntu's separately-version-sequenced package ecosy

(Specific, upstream-provided) PPAs are the main reason I use Ubuntu Server. Given that they're built against Ubuntu's separately-version-sequenced package ecosystem, I can't expect PPAs that install cleanly on Ubuntu to be able to find the same packages required to install cleanly on Debian. If I could, I'd just use Debian and then forcibly add the PPAs as apt sources.