Install latest/stable of ksuperkey
Ubuntu 16.04 or later?
Make sure snap support is enabled in your Desktop store.
ksuperkey allows you to open the application launcher in various DEs (such as KDE Plasma or XFCE) using the Super key (also known as "Meta" or "the Windows key"). If you hold down the Super key it will still act as a modifier key, allowing you to use it for other keyboard shortcuts. ksuperkey is a small desktop-agnostic application that runs in the background as a daemon. It was forked from xcape by Albin Olsson: https://github.com/alols/xcape
Usage
ksuperkey [-d] [-t timeout-ms] [-e map-expression]
Further documentation at: https://github.com/hanschen/ksuperkey
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Choose your Linux distribution to get detailed installation instructions. If yours is not shown, get more details on the installing snapd documentation.