Hi!
Damn, I though this issue was solved… It’s due to an incompatible default nginx configuration for your system.
The similar main issue happens on system on which IPv6 support is disabled. As the default configuration defines to listen on IPv6 localhost, it causes failure on service restart. But this should be solved now…
You can try to have a look at your *.conf files in /etc/nginx/conf.d, or paste it here the one of your main domain if you don’t find anything.
Did you try with the YunoHost image for Raspberry Pi?
Jerome