E: The repository ‘http://ppa.launchpad.net/certbot/certbot/ubuntu focal Release’ does not have a Release file.

Gareth Eaton
 

I got rid of the error message on Ubuntu 20.04 by removing the ppa repository. 

  • sudo apt-add-repository -r ppa:certbot/certbot

After that,

  • sudo apt update
  • sudo apt-get update

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