I'm happy to be corrected; for the record I searched for this before posting, and found things like https://linuxconfig.org/how-to-install-the-latest-amd-radeon

I'm happy to be corrected; for the record I searched for this before posting, and found things like https://linuxconfig.org/how-to-install-the-latest-amd-radeon-drivers-on-ubuntu-18-04-bionic-beaver-linux https://linuxconfig.org/how-to-install-the-latest-amd-radeon... which are very recent and talk about installing AMD proprietary drivers. (I haven't been tracking this closely since I've avoid NVidia and ATI (hence AMD) graphics for about 15 years, due to their driver blobs)