Hi Jonas,I found this bug as I had the same problem as Jon. In my case I simply tried to start the radicale by simply calling "radicale" as root.
It makes sense to make the "Debian way" the default for the package but less proficient users may need some hints about how to use this. I started a wiki article[0] and documented the steps you mentioned here.
thanks for your work, regards, matthias [0] https://wiki.debian.org/Radicale
