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Thank you for your efforts. But I'm afraid I don't have enough experience with any of this to know what steps to accept and what steps to reject within the long articles. I tried a few of the most "obvious" suggestions, but nothing has yet to change the error message I am getting.
I don't understand why my VPS cannot do a simple command that others are able to do with no problem.
At one point in time my server was able to install and run certbot. But then I had to delete my Plesk control panel because they started charging a lot of money for a license. I think that deleting Plesk messed up a lot of things. But how to fix various things, I have no clue about.
I see the changes I made have messed everything up so I cannot even access my VPS now.