"cannot open display: :0" error when using sudo with any GTK app

sudo gtk
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For graphical applications use gksu:

gksu gsmartcontrol

If it is not installed on your system you can get it via:

apt-get install gksu

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HeavyHydrogen
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HeavyHydrogen

Updated on September 18, 2022

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  • HeavyHydrogen
    HeavyHydrogen over 1 year

    I want to run gmsartcontrol (UI tool for smartctl) which needs to be run as root in order to access the drives and read their SMART status.

    However doing this:

    sudo gmsartcontrol

    I get this error:

    No protocol specified
    [gtk] cannot open display: :0

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