Unfortunately, this is a laptop on my window sill and the link is not configured for servers. The provider doesn't make any problems because of me having a server, but they will not get an inch beyond "access to internet" service.

Here is the output from #yunohost diagnostics – there is some cryptic problem indeed. It may be a matter of configuration of my local router, but I do not know how to manage it :(

So it seems that the solution would be either to make it send requests via IPv4 or somehow make port 443 available via IPv6.

I have no knowledge how to do it, but I am happy to try, under someone's guidance.

I did it and right now I am trying to add libranet again.

edit: no avail. :(

So, I tried to get to "the installation base" without going sudo. Initially no cure, but then, suddenly!

admin@tepewu:/var/www$ cd friendica
-bash: cd: friendica: Permission denied
admin@tepewu:/var/www$ friendica/bin/console relay add
-bash: friendica/bin/console: Permission denied
admin@tepewu:/var/www$ friendica/bin/console relay add https://relay.libranet.de/actor
-bash: friendica/bin/console: Permission denied
admin@tepewu:/var/www$ sudo friendica/bin/console relay add https://relay.libranet.de/actor
Successfully added https://relay.libranet.de/actor
admin@tepewu:/var/www$ 

However still

admin@tepewu:/var/www$ sudo friendica/bin/console relay add https://en.relay.friendi.ca/actor
https://en.relay.friendi.ca/actor couldn't be added
admin@tepewu:/var/www$