I am using UBUNTU 20.04 lts. When I add repository, the message comes like "COMMAND NOT FOUND" Can anyone tell how to add repository to install cobang application on ubuntu 20.04 lts.
(base) thilipkumar@thilipkumar-Inspiron-5520:~/Downloads$ sudo add-apt-repository ppa:ng-hong-quan/ppa
[sudo] password for thilipkumar:
sudo: add-apt-repository: command not found