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Progress towards universal Copy/Paste shortcuts on Linux
(mark.stosberg.com)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
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I found this handy snippet to enable these keys in GTK 2 and 3 (not sure of the equivalent for GTK 4 but I guess that's the one which has been updated anyway): https://forum.colemak.com/topic/1438-dreymars-big-bag-of-keyboard-tricks-linuxxkb-files-included/#p10012
Unfortunately I've found this whilst I'm not at the right computer so I haven't been able to test them.
Edit: I tested this and it doesn't appear to have helped.