So I have Plymouth running, but how do I change the startup theme?

[Stefan Baur <newsgroups.mail2@stefanbaur.de>]

Hi List,

After quite some fruitless attempts at getting plymouth to work, I
managed to get it running by installing the following packages:

desktop-base
libplymouth4
plymouth
plymouth-label

It seems that in my previous attempts, at least one of the first two
wasn't pulled in, and thus it wasn't working.

A package named "desktop-base" isn't exactly where one would expect
plymouth themes, anyway ...

So, now I have it working, but it keeps displaying the "futureprototype"
theme at startup.

What I've tried, between the "lb config" and "lb build" steps, is to
alter where etc/alternatives/desktop-theme points, by placing a symlink
pointing at the "joy" theme instead there, and when that failed, I
instead changed etc/plymouth/plymouth.conf to:

[Daemon]
Theme=joy

However, neither attempt led me to a differently-themed bootsplash.

So what's the proper way of switching to a different startup theme,
preferably a custom-made one?

Kind Regards,
Stefan Baur