Install software-properties-gtk by entering the following commands in the terminal:
sudo apt update sudo apt install software-properties-gtk
Description:
manage the repositories that you install software from (gtk)
This software provides an abstraction of the used apt repositories. It allows you to easily manage your distribution and independent software vendor software sources. . This package contains a GTK+ based graphical interface.
Version: 0.96.24.32.1
Section: gnome