I've had ongoing difficulties installing pgAdmin 4. These difficulties have to do with the way pgAdmin is packaged and distributed.
For example, I use LinuxMint and Manjaro. The pgAdmin distributions support neither. Although Mint is a derivative of Ubuntu, lsb_release -cs returns a value not usable by pgAdmin's distribution system. I had to tweak internal files to get it to work.
I'd like to suggest using snap, flatpack, or AppImage. Using one of these, pgAdmin would be trivial to install on nearly any distro and on nearly any version of those distros. Secondly, you'd have to maintain far fewer builds.
The only negative to using one of these is that the installations would be a bit larger. This is a very small penalty to get the portable and convenience these package managers provide.