GNU/Linux Debian Stretch Add Backports Repo Guide

Setting Up Repo

3. 2. Adding Backports Repo

   Then to Add Backports Repository for Debian 9
   Simply execute:

   su -c "echo 'deb http://deb.debian.org/debian stretch-backports main' >> /etc/apt/sources.list.d/backports.list"

   Again to get Installed the Proprietary Drivers add also Contrib and Non Free sources like:

   su -c "echo 'deb http://deb.debian.org/debian stretch-backports main contrib non-free' >> /etc/apt/sources.list.d/backports.list"

   The Setup includes ‘contrib‘ and ‘non-free‘ Sources.
   If you want to further Managing these Sources see: Debian Non-free Repo Setup.

4. 3. Refreshing Debian Sources

   Next to Refresh Debian Apt Repo Sources
   Play:

   sudo apt update

   Authenticate with the User Admin Pass.
   If Got “User is Not in Sudoers file” then see: How to Enable sudo.