Installing python3-software-properties package on Debian Unstable (Sid) is as easy as running the following command on terminal:
sudo apt-get update sudo apt-get install python3-software-properties
python3-software-properties package information
|distro||Debian Unstable (Sid)|
|description||manage the repositories that you install software from|
|maintainer||Julian Andres Klode|
More information about apt-get install
apt-get install is followed by one or more packages desired for installation or upgrading. Each package is a package name, not a fully qualified filename. All packages required by the package(s) specified for installation will also be retrieved and installed. The /etc/apt/sources.list file is used to locate the desired packages. If a hyphen is appended to the package name (with no intervening space), the identified package will be removed if it is installed. Similarly a plus sign can be used to designate a package to install. These latter features may be used to override decisions made by apt-get's conflict resolution system.