Looking into how the Plymouth unencrypt screen on Fedora 35 and Ubuntu 20.04.4 LTS are different. I know that both are using the BGRT Plymouth theme, and upon inspection the two configurations appear to be the same (unless I’ve missed something). How does Fedora show the keyboard and keyboard locale vs Ubuntu shows text? I’m not seeing how to change one to the other…could it stem from an upstream configuration before compiled and packaged?
I’m not sure if this helps, but you can see Fedora specific patches to Plymouth here: Tree - rpms/plymouth - src.fedoraproject.org
I could be wrong, since I didn’t look at Ubuntu’s source, but I don’t see anything in the rpm that is overriding this for the luks screen. It seems likely we’re following upstream behavior here and Ubuntu has patched it or chosen a different theme configuration to do something different by default.
Output from live cd Ubuntu 20.4.4
You might have to check what you got on ubuntu after updating it.
plymouth/focal-updates,now 0.9.4git20200323-0ubuntu6.2 amd64 [installed]te code here
Fedora 35 plymouth-0.9.5-3.20210331git1ea1020.fc35