I can see the issue referred to above has now been closed but I still do not see any nightly builds for 22.10 (There are stable builds for 22.10 though)
A build was run last night and one was kicked off 40 mins ago and 22.10 still not included. Does this still need some work on the build server to include 22.10?
6.99 works on Mint 20.3 Una and 21 Vanessa. That is all I have ever tried.
You install a 6.99 from here: https://www.kicad.org/download/
6.99 installation is below the 6.0.9 installation. The two programs are totally independent of each other (so don’t forget the libraries, the “recommended” button).
Once you have installed 6.99, updates will appear nightly, or daily, in your “Update Manager”.