Updating from such a repository can't be done securely, and is disabled by default

$ sudo add-apt-repository ppa:openlp-core/release
 Official releases of OpenLP
 More info: https://launchpad.net/~openlp-core/+archive/ubuntu/release
Press [ENTER] to continue or Ctrl-c to cancel adding it.

Hit:1 http://us.archive.ubuntu.com/ubuntu bionic InRelease
Hit:2 http://archive.canonical.com/ubuntu bionic InRelease                    
Hit:3 http://ppa.launchpad.net/obsproject/obs-studio/ubuntu bionic InRelease  
Hit:4 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease            
Hit:5 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease          
Get:6 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]   
Ign:7 http://ppa.launchpad.net/openlp-core/release/ubuntu bionic InRelease    
Err:8 http://ppa.launchpad.net/openlp-core/release/ubuntu bionic Release      
  404  Not Found [IP: 91.189.95.83 80]
Reading package lists... Done                     
E: The repository 'http://ppa.launchpad.net/openlp-core/release/ubuntu bionic 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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