帮助从我的Ubuntu 20.04删除PPA

I am trying to remove this Err:16 https://download.docker.com/linux/ubuntu focal Release. I have gone into this picture below: enter image description here

But i can't find https://download.docker.com/linux/ubuntu focal Release. Where on Ubuntu can you find this ppa-file list. I have tried something with etc but i can't find it!

[fre apr 24 20:00:09] Jonathan@Whats next?:~$ sudo apt update
Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease
Get:2 http://se.archive.ubuntu.com/ubuntu focal InRelease [265 kB]             
Hit:3 http://dl.google.com/linux/chrome/deb stable Release                     
Hit:4 http://se.archive.ubuntu.com/ubuntu focal-updates InRelease              
Hit:5 http://se.archive.ubuntu.com/ubuntu focal-backports InRelease            
Hit:6 http://security.ubuntu.com/ubuntu focal-security InRelease               
Hit:9 https://storage.googleapis.com/bazel-apt stable InRelease                
Hit:10 https://deb.nodesource.com/node_13.x focal InRelease                    
Ign:11 http://repo.vivaldi.com/stable/deb stable InRelease                     
Hit:12 https://packages.microsoft.com/repos/vscode stable InRelease            
Hit:7 https://cli-assets.heroku.com/branches/stable/apt ./ InRelease           
Hit:8 https://cli-assets.heroku.com/apt ./ InRelease                           
Hit:13 http://repo.vivaldi.com/stable/deb stable Release                       
Ign:8 https://cli-assets.heroku.com/apt ./ InRelease                           
Ign:15 https://download.docker.com/linux/ubuntu focal InRelease                
Hit:14 https://cli-assets.heroku.com/apt ./ Release                            
Err:16 https://download.docker.com/linux/ubuntu focal Release                  
  404  Not Found [IP: 52.85.241.112 443]
Hit:17 https://download.sublimetext.com apt/stable/ InRelease                  
Hit:20 https://dl.yarnpkg.com/debian stable InRelease                          
Hit:18 https://packagecloud.io/AtomEditor/atom/any any InRelease
Hit:21 http://ppa.launchpad.net/apt-fast/stable/ubuntu focal InRelease
Hit:22 http://ppa.launchpad.net/apt-fast/stable/ubuntu disco InRelease
Hit:23 http://ppa.launchpad.net/git-core/ppa/ubuntu focal InRelease
Hit:24 http://ppa.launchpad.net/git-core/ppa/ubuntu disco InRelease
Hit:25 http://ppa.launchpad.net/kritalime/ppa/ubuntu focal InRelease
Hit:26 http://ppa.launchpad.net/kritalime/ppa/ubuntu disco InRelease
Hit:27 http://ppa.launchpad.net/linrunner/tlp/ubuntu focal InRelease
Hit:28 http://ppa.launchpad.net/linrunner/tlp/ubuntu disco InRelease           
Hit:29 http://ppa.launchpad.net/swi-prolog/stable/ubuntu disco InRelease       
Reading package lists... Done                                                  
E: The repository 'https://download.docker.com/linux/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.
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