I'm not sure where to post this, so, hopefully I'm not too far off here.
Doesn't offer the ability to install version 10.4 on Ubuntu 20.04/Focal. Not only that, there's no actual repos for Ubuntu 20.04/Focal with MariabDB 10.4, so manually adjusting the apt repo string doesn't work. Manually adjusting then doing 'apt update', results in:
The repository 'http://mirror.biznetgio.com/mariadb/repo/10.4/ubuntu focal Release' does not have a Release file.