How to Add Multimedia Repository for Debian-Based Systems

Setting Up Repo

2. 2. Adding Multimedia Repo GPG Key

   First, Add Multimedia GPG Signature Key
   Download it with:

   cd ~/Downloads && sudo wget http://www.deb-multimedia.org/pool/main/d/deb-multimedia-keyring/deb-multimedia-keyring_2016.8.1_all.deb

   And then Install it:

   sudo dpkg -i deb-multimedia-keyring_2016.8.1_all.deb

3. 3. Adding Multimedia Repo

   Then to Add Multimedia Repository for Debian
   For Debian Stable (At this time Bullseye) simply execute:

   su -c "echo 'deb https://www.deb-multimedia.org stable main non-free' >> /etc/apt/sources.list.d/multimedia.list"

   And then again to enable also the Backports:

   su -c "echo 'deb https://www.deb-multimedia.org stable-backports main' >> /etc/apt/sources.list.d/multimedia.list"

   So the above Setup is valid for all the currently Stable based Distros, like MX Linux, possibly after a System Upgrade.
   But when a New Debian Relase is coming then you should see instead the OldStable Setup below.
   Then for the Debian Testing release (Currently Bookworm):

   su -c "echo 'deb https://www.deb-multimedia.org testing main non-free' >> /etc/apt/sources.list.d/multimedia.list"

   Course this Repo is valid for all the Testing based Distros like SparkyLinux.
   Taking care that when there’s a New Debian release is suitable instead to follow the above Stable Setup.
   Instead for Sid run:

   su -c "echo 'deb https://www.deb-multimedia.org sid main non-free' >> /etc/apt/sources.list.d/multimedia.list"

   Next for the OldStable (Nowadays Buster):

   su -c "echo 'deb https://www.deb-multimedia.org oldstable main non-free' >> /etc/apt/sources.list.d/multimedia.list"

   And again for the Backports:

   su -c "echo 'deb https://www.deb-multimedia.org buster-backports main' >> /etc/apt/sources.list.d/multimedia.list"

   Following, for OldOldStable (At present Stretch):

   su -c "echo 'deb http://www.deb-multimedia.org oldoldstable main non-free' >> /etc/apt/sources.list.d/multimedia.list"

   And to Add also the Backports yet:

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

   Last, for Experimental carry out:

   su -c "echo 'deb http://www.deb-multimedia.org experimental main' >> /etc/apt/sources.list.d/multimedia.list"

   Next to Refresh Debian Apt Repo Sources
   Play:

   sudo apt update