Tente estes:
sudo apt-get install software-properties-common
e / ou
sudo apt-get install python3-software-properties
e / ou
sudo apt-get install python-software-properties
Eu quero instalar:
add-apt-repository ppa:ricotz/testin
Está mostrando:
The program add-apt-repository is currently not installed.
You can install it by typing:
sudo apt-get install python-software-properties
O que devo fazer agora?
Tente estes:
sudo apt-get install software-properties-common
e / ou
sudo apt-get install python3-software-properties
e / ou
sudo apt-get install python-software-properties