Originally Posted by AmericadelSur
When I tried to use the 'sudo add-apt-repository ppa
pencpn/opencpn' command, I had a OpenGPG error, so I assumed it was forcing HTTPS. I decided to add manually the sources, using
When you have an OpenGPG error I expect you have a problem with the key the developer supplied. No valid key usually means no packages (and problems using "apt update").
On a laptop
with Debian I have a hard time using add-apt-repository (since it is a ubuntu addition). Adding the launchpad lines to sources.list and adding the key are the main points. So as long as you add both key and PPA, there should be no problem.
You have installed opencpn using apt?
Then you probably already crossed this bridge.
What do you see when you type "apt-cache search opencpn"?
From your post I can't get a clear picture, since in my understanding when you can install opencpn, weatherrouting should be available (both in xenial and bionic, I use bionic since my debian-version is newer). Therefore the apt-cache list might give some clues.
$ dpkg -l | grep opencpn
ii opencpn 5.0.0-0~bionic1 amd64 Concise chartplotter and navigation software
ii opencpn-plugin-weatherrouting 1.300.1-0~bionic1 amd64 Plugin for OpenCPN