Setting Up Repo
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2. Adding Backports RepoThen 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.
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3. Refreshing Debian SourcesNext 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.
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