après obtention d'un fichier .pem, copie vers /home/useradmin/server_and_domain_name.pem
cd /etc/apache2/ssl
ls -la
sudo mv server_and_domain_name.pem server_and_domain_name.pem.old2022
sudo mv /home/usersadmin/server_and_domain_name.pem server_and_domain_name.pem
sudo chown root:root server_and_domain_name.pem
sudo service apache2 restart