I did it, I redid the steps in the tutorial and it worked. But I had to remove apache2. Now the nginx screen with nextcloud appeared. Thanks. Great tutorial.

“localhost” means that the MariaDB server is on the same server with your website.
You can change the password with the following command:

GRANT ALL PRIVILEGES ON nextcloud.* TO 'nextcloud'@'localhost' IDENTIFIED BY 'your-new-password';

Please check the Nginx configuration with the following command:

# /usr/sbin/nginx -t

According to the message the Nginx installer doesn’t understand your Nginx configuration.

Please double-check a server_name:

server_name your-domain.com www.your-domain.com;

You need to replace your-domain.com with a valid domain name pointed to your server.

Deploying certificate
Could not install certificate

NEXT STEPS:
– The certificate was saved, but could not be installed (installer: nginx). After fixing the error shown below, try installing it again by running:
certbot install –cert-name MyDomainName.com

Could not automatically find a matching server block for MyDomainName.com. Set the `server_name` directive to use the Nginx installer.
Ask for help or search for solutions at https://community.letsencrypt.org. See the logfile /var/log/letsencrypt/letsencrypt.log or re-run Certbot with -v for more details.

What part of this line needs to be specific to my server?
Also if I didn’t change the ‘Password’ , (I’m stupid and just copied that line as is.) How do i fix it now? How do I change the password, and does the password need to be inside the single quote mark? It needs an example on this STEP 5.

thanks, it works

Your Nginx exists at /usr/sbin/nginx. You can create a symlink (symbolic) by using the ln command:

# ln -s /usr/sbin/nginx /usr/bin/nginx

Then execute the command:

# certbot --nginx -d your-domain.com -d www.your-domain.com