Ken Dibble <ken@???> writes:
> I don't know python, but I am guessing that it would be easy enough to fix
>
> this problem for someone who does know python.
>
> Package name: software-properties-common
>
> Package version 0.99.30-4.1~deb12
>
> File name: add-apt-repository

[...]

> Error: could not find a
> distribution template for Devuan/daedalus

The Devuan template file should be
/usr/share/python-apt/templates/Devuan.info. Mine contains entries for
daedalus and add-apt-repository works for me.

Maybe helpful: https://dev1galaxy.org/viewtopic.php?id=7058