How to install 'add-apt-repository' using the terminal? [duplicate]

I want to install:

add-apt-repository ppa:ricotz/testin

It is showing:

The program add-apt-repository is currently not installed.
You can install it by typing:
sudo apt-get install python-software-properties

What should I do now?


Try these:

sudo apt-get install software-properties-common

and/or

sudo apt-get install python3-software-properties

and/or

sudo apt-get install python-software-properties