How to Add Debian Stable Repository on Debian Based Systems

Setting Up Repo

2. 2. Adding Repo

   Then to Add Debian Stable Repository
   Simply Copy and Execute this Command:

   (And in case of “su: Authentication failure” try instead with “sudo su“)

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

   Finally, to Enable also the Contrib and Non-free Repos Instead:
   (And in case of “su: Authentication failure” try instead with “sudo su“)

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

   Possibly Change the Debian Mirror in base of your Location

   Debian Ftp Mirror List

   Debian Servers Worldwide List.

   Finally, Ctrl+x to Save & Exit from nano Editor :)

3. 3. Setting Up Default

   Then to Set the Default Release
   And this is Indispensable to Preserve the Stability of the System in Case of Updates/Upgrades!
   Make or Edit the Apt Config File:

   sudo nano /etc/apt/apt.conf

   And Depending of your Release Append
   For an OldStable Based OS:

   APT::Default-Release "oldstable";

   Possibly if needed to Find out What’s your actual Repo Base
   Use the cat Command like:

   cat /etc/apt/sources.list

   Or again look into the sources Directory to find out eventual others Repos:

   cat /etc/apt/sources.list.d/*.list

   Thanks to dracae

4. 4. Enabling Repo

   Finally, to Re-Load Repositories
   Do:

   sudo apt update

5. 5. Installing Single Package

   Finally, to Install One Package from Stable Repo
   Execute:

   sudo apt -t stable install [MYCOOLPACKAGE]

   So for instance:

   sudo apt -t stable install firefox

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