Removing anbox on debian

I’ve installed snap on debian and tried anbox.

Now I want to remove anbox.
Sofar, I removed it via snap (snap remove anbox) but according to the official docs* you have to remove some kernel modules also.

The instructions given

$ sudo apt install ppa-purge
$ sudo ppa-purge ppa:morphis/anbox-support

do not work under debian because ppa-purge is not in its repository.
What should I do to remove the kernel modules?