Your system is not supported by certbot-auto anymore

[rg305]

sudo -H certbot certonly --apache -d mydomain.com
OR
sudo -H /snap/bin/certbot certonly --apache -d mydomain.com
OR EVEN:
cd /snap/bin
sudo -H ./certbot certonly --apache -d mydomain.com

But NOT:
sudo -H ./certbot certonly --apache -d mydomain.com
after this:

@alex_ivet360

I've always went to cd /opt/letsencrypt to run the commands:

That effectively issues this command:
sudo -H /opt/letsencrypt/certbot certonly --apache -d mydomain.com

And that is NOT where certbot is anymore.
which certbot
find / -name certbot