Updated Jellyfin Debian Repository (markdown)

Jellyfin-Debian-Repository.md

@@ -10,7 +10,7 @@ The Jellyfin packages in the repository are self-contained binaries, and do not
     ```
 0. Add an entry to `/etc/apt/sources.list.d/jellyfin.list`:
     ```
-    echo "deb https://repo.jellyfin.org/debian $( grep -Ewo -m1 --color=none 'jessie|stretch|buster' /etc/os-release || echo buster ) main" | sudo tee /etc/apt/sources.list.d/jellyfin.list
+    echo "deb https://repo.jellyfin.org/debian $( grep -Ewo -m1 --color=none 'jessie|stretch|buster' /etc/os-release || echo ubuntu ) main" | sudo tee /etc/apt/sources.list.d/jellyfin.list
     ```
     Note that this will set the release to `buster` for Ubuntu systems - this should be OK for most releases.
 0. Update APT repositories: