Mint and Pop come to mind if you want to stay in the Ubuntu ecosystem without snaps. Debian is even more stable and retains apt as a package manager, but you w

Mint and Pop come to mind if you want to stay in the Ubuntu ecosystem without snaps. Debian is even more stable and retains apt as a package manager, but you will have older packages for stability and have to customize it a little. If you can venture out of the Ubuntu space, I have found Manjaro to be an excellent experience in the few months I used it earlier this year. It has very fresh packages since it is Arch-based, but also uses an LTS kernel and has some measures in place on its own repositories for stability's sake. I can't attest to the effectiveness of the latter since I've never had stability issues on Arch, but Manjaro is certainly wonderful out of the box and a very pleasant experience in my opinion.