Question

how to remove this repository ppa:webupd8team/java

Hit:14 http://ppa.launchpad.net/linuxuprising/java/ubuntu focal InRelease      
Ign:15 http://ppa.launchpad.net/webupd8team/java/ubuntu focal InRelease        
Err:16 http://ppa.launchpad.net/webupd8team/java/ubuntu focal Release          
  404  Not Found [IP: 91.189.95.83 80]
Reading package lists... Done                                                  
E: The repository 'http://ppa.launchpad.net/webupd8team/java/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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Hi there,

The manual way of doing this is, to use the grep command and search for any references of the webupd8team repository in your source list:

  1. sudo grep -r "webupd8team" /etc/apt/*

After that using your favorite text editor open the file and remove the line referencing the `webupd8teamz repository.

Finally, run:

sudo apt update

Another option is to use the apt-add-repository command with the --remove flag:

sudo apt-add-repository --remove repo_name_here

Hope that this helps! Regards, Bobby