Python-virtualenv has no installation candiate

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My domain is:SSL for my app

I ran this command: ./letsencrypt-auto certonly --email myemail.com -d mydomain.com

It produced this output:Package ‘python-virtualenv’ has no installation candiate

My web server is (include version): UBUNTU 20.04

The operating system my web server runs on is (include version): Windows 10

My hosting provider, if applicable, is:

I can login to a root shell on my machine (yes or no, or I don’t know):yes

I’m using a control panel to manage my site (no, or provide the name and version of the control panel):

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you’re using Certbot):

What is it, Ubuntu or Windows? Also, Ubuntu isn’t a webserver, it’s a Linux distribution.

If you’re really running Ubuntu 20.04, please use the standard Ubuntu package, unless you have a really, really good reason to use the certbot-auto script. (I’m guessing you’re using some very ancient guide which you probably shouldn’t use.)

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