Public bug reported:

sudo apt update
Hit:1 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Hit:2 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease              
         
Hit:3 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease            
         
Hit:4 http://security.ubuntu.com/ubuntu xenial-security InRelease               
                                                    
Ign:5 http://ppa.launchpad.net/takluyver/matplotlib-daily/ubuntu xenial 
InRelease                                                   
Hit:6 http://ppa.launchpad.net/yubico/stable/ubuntu xenial InRelease           
Err:7 http://ppa.launchpad.net/takluyver/matplotlib-daily/ubuntu xenial Release
  404  Not Found [IP: 185.125.190.52 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/takluyver/matplotlib-daily/ubuntu 
xenial 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.

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1988591

Title:
  apt update fails with ` 404 Not Found [IP: 185.125.190.52 80]`

Status in apt package in Ubuntu:
  New

Bug description:
  sudo apt update
  Hit:1 http://us.archive.ubuntu.com/ubuntu xenial InRelease
  Hit:2 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease            
           
  Hit:3 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease          
           
  Hit:4 http://security.ubuntu.com/ubuntu xenial-security InRelease             
                                                      
  Ign:5 http://ppa.launchpad.net/takluyver/matplotlib-daily/ubuntu xenial 
InRelease                                                   
  Hit:6 http://ppa.launchpad.net/yubico/stable/ubuntu xenial InRelease          
 
  Err:7 http://ppa.launchpad.net/takluyver/matplotlib-daily/ubuntu xenial 
Release
    404  Not Found [IP: 185.125.190.52 80]
  Reading package lists... Done
  E: The repository 'http://ppa.launchpad.net/takluyver/matplotlib-daily/ubuntu 
xenial 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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