$schemamarkup = get_post_meta(get_the_ID(), 'schemamarkup', true); if(!empty($schemamarkup)) { echo $schemamarkup; }

GNU/Linux Debian Testing Non-free Repository Add Step-by-step

October 18, 2019 | By the+gnu+linux+evangelist.

Adding Repo

  1. 2. Adding Non-free Repo

    Then to Add Non Free Repository in Debian Testing
    Simply run:

    sudo apt-add-repository non-free

    Again you may need enabled also the Contrib one, so play:

    sudo apt-add-repository contrib

    Last, Refresh the Apt Sources with:

    sudo apt update

  2. 3. Preserving Debian Free System

    (Optional) This if you want to Preserve the Valuable Free Nature of Debian System.
    To do so you have to strictly Allowing only the Installation of Some Non-free Package with an Apt Pinning.
    First, Disable All Non free Software with this content:

    Explanation: Disable packages from non-free tree by default
Package: *
Pin: release o=Debian,a=stable,l=Debian,c=non-free
Pin-Priority: -1

    To Make it at once execute:

    sudo echo -e "Explanation: Disable packages from non-free tree by default
Package: *
Pin: release o=Debian,a=stable,l=Debian,c=non-free
Pin-Priority: -1" > /etc/apt/preferences.d/non-free_policy

    And then Enable the Software of Choice, E.g. firmware-iwlwifi:

    Explanation: Enable package firmware-iwlwifi from non-free tree
Package: firmware-iwlwifi
Pin: release o=Debian,a=stable,l=Debian,c=non-free
Pin-Priority:0

    Again with a simple echo:)

    sudo echo -e "Explanation: Enable package firmware-iwlwifi from non-free tree
Package: firmware-iwlwifi
Pin: release o=Debian,a=stable,l=Debian,c=non-free
Pin-Priority:0" > /etc/apt/preferences.d/firmware-iwlwifi_non-free

    But to enable Multiple packages at once proceed like that:

    Explanation: Enable package firmware-iwlwifi nvidia-driver from non-free tree
Package: firmware-iwlwifi nvidia-driver
Pin: release o=Debian,a=stable,l=Debian,c=non-free
Pin-Priority:0

    Again translated in a Command like:

    sudo echo -e "Explanation: Enable package firmware-iwlwifi nvidia-driver from non-free tree
Package: firmware-iwlwifi nvidia-driver
Pin: release o=Debian,a=stable,l=Debian,c=non-free
Pin-Priority:0" > /etc/apt/preferences.d/enabled-packages_non-free

    The only drawback of the procedure is that you have to repeat it every time you need some new Non-free software…
    For further instructions see: Advanced Apt Pinning Techniques.

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