Auto-update Plex Server on Linux

I just stole the entire text from Plex’s web site:

DEB-based distros (Ubuntu, etc.)
The PMS package will automatically do all repository setup for you on Debian 10+/Ubuntu 20.04+ installations, including obtaining the package signing key.

To enable use of the repository edit the last line of the file 

Find the line:

#deb https://downloads.plex.tv/repo/deb/ public main

To use the repository, simply change this line to remove the comment character # and save the file

deb https://downloads.plex.tv/repo/deb/ public main

Update on 24.01.2025. I’m having problems with both auto and manual update because there are security issues. I found a very simple solution: PlexUpdate script that solves all these problems and adds a lot of useful options!