Thanks for your help (again).
The apt-get purge didn’t help (“Package ‘openhab2-addons’ is not installed, so not removed”).
I stopped OpenHAB, deleted the contents of the /kar, /tmp and /cache folder.
I started OpenHAB. I had some various error messages at first boot. I did nothing more than reboot a few times and now they are gone.
Now I get:
openhab> bundle:list|grep -i astro
207 | Active | 80 | 0.9.0.201709011622 | Astro Binding
So I expect the trigger will run fine when the sun sets.
Thanks!