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New to Linux? Ubuntu Isn’t Your Only Option
(www.howtogeek.com)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
"PPA" is Ubuntu's branding for third party repositories. So, of course you will have a hard time adding a Ubuntu-specific third-party repository to anything that isn't the Ubuntu version it's made for...
Debian of course supports third party repos, just like Ubuntu. On Debian they just aren't called "PPA".
For more information on how to add third party repos to Debian (or Ubuntu, if you don't use Canonical's weird tooling), check out the Debian Wiki page on UseThirdParty or SourcesList. There's also an (incomplete) list of third party repositories on the wiki: Unofficial. And just like with PPAs, anyone can host a Debian repo.