Tecadmin published a quick tutorial about how to install apt-add-repository on Ubuntu and Debian.
(Solved) apt-add-repository command not found – Ubuntu & Debian
The apt-add-repository command is a symlink of the add-apt-repository command. Which is used to add third party PPA to our Ubuntu or Debian systems. This command comes under software-properties-common debian package. Which is not available under the minimal Ubuntu installation, but this package can be installed from default system repositories.
(Solved) apt-add-repository command not found – Ubuntu & Debian