➜ sources.list.d sudo add-apt-repository ppa:certbot/certbot
This is the PPA for packages prepared by Debian Let's Encrypt Team and backported for Ubuntu.
Note: Packages are only provided for currently supported Ubuntu releases.
More info: https://launchpad.net/~certbot/+archive/ubuntu/certbot
Press [ENTER] to continue or Ctrl-c to cancel adding it.
Hit:1 https://repos.insights.digitalocean.com/apt/do-agent main InRelease
Hit:2 http://dl.google.com/linux/chrome/deb stable InRelease
Get:3 http://mirrors.digitalocean.com/ubuntu focal InRelease [265 kB]
Hit:4 https://dl.yarnpkg.com/debian stable InRelease
Hit:5 http://mirrors.digitalocean.com/ubuntu focal-updates InRelease
Hit:6 http://mirrors.digitalocean.com/ubuntu focal-backports InRelease
Ign:7 http://ppa.launchpad.net/certbot/certbot/ubuntu focal InRelease
Hit:8 http://archive.ubuntu.com/ubuntu focal InRelease
Get:9 http://security.ubuntu.com/ubuntu focal-security InRelease [107 kB]
Hit:10 https://deb.nodesource.com/node_14.x focal InRelease
Err:11 http://ppa.launchpad.net/certbot/certbot/ubuntu focal Release
404 Not Found [IP: 91.189.95.83 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/certbot/certbot/ubuntu focal Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
it shows weird error.