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Given: all default 20.04.4 LTS; IBM Modell 300 keyboard, which has no Super (Windows) key.

How can I let Caps Lock key behave as Super key?

I tried running xmodmap -e "keycode 66 = Super_L NoSymbol Super_L" in a terminal window. An individual press of Caps Lock does what Super did. However, Caps Lock+D does not do what Super+D did (show desktop in GDM3)

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2 Answers 2

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In "Gnome Tweaks" (not installed by default), click "Additional Layout Options".

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There, you will find the xkb option "Make CapsLock an additional Super" in the section "Caps Lock Behavior".

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While xmodmap also could be used, it is (unfortunately) becoming deprecated in modern desktops. It may be unreliable - stop working when you change keyboard layout, resume from sleep state or attach another keyboard.

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For me this was a "Keyboard Layout Option" in the (GUI) settings:

Caps Lock behaviour => Make Caps Lock an additional Super.

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  • I wonder if it's different in GDM3 (default of 20.04). I'm unable to find "Keybaord Layout Options" (looking like this: i.sstatic.net/i2ROo.png)
    – Xpector
    Apr 18, 2022 at 14:59

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