При установке на голую систему получил сообщение

Selecting previously unselected package ssl-cert.
Preparing to unpack .../9-ssl-cert_1.0.39_all.deb ...
Unpacking ssl-cert (1.0.39) ...
Setting up libapr1:armhf (1.5.2-5) ...
Setting up apache2-data (2.4.25-3+deb9u6) ...
Setting up ssl-cert (1.0.39) ...
hostname: Name or service not known
make-ssl-cert: Could not get FQDN, using "raspberrypi".
make-ssl-cert: You may want to fix your /etc/hosts and/or DNS setup and run
make-ssl-cert: make-ssl-cert generate-default-snakeoil --force-overwrite
make-ssl-cert: again.