Installation of Cert via Certbot failed

Hey, thanks for the reply!

I do have an existing vhosts-file for this domain which looks like the following:

root@rikku: /var/www/html/aerith
# cat /etc/apache2/sites-available/realitaetsverlust.rocks.conf
<VirtualHost *:80>
    ServerName blog.realitaetsverlust.rocks
    Serveralias www.blog.realitaetsverlust.rocks
    ServerAdmin webmaster@realitätsverlust.rocks
    DocumentRoot "/var/www/html/aerith"

    ErrorLog ${APACHE_LOG_DIR}/aerith.error.log
    CustomLog ${APACHE_LOG_DIR}/aerith.access.log combined
</VirtualHost>

<VirtualHost *:80>
    ServerName realitaetsverlust.rocks
    Serveralias realitaetsverlust.rocks
    ServerAdmin webmaster@realitätsverlust.rocks
    DocumentRoot "/var/www/html"

    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>