Ok, so I have tried adding a custom keybinding so that Control+n does the 
copying:
(keybinding "c:n"
            (lambda (editor evt) (send editor copy)))

Works perfect, but conflicts a bit with my muscle memory. 
So I tried adding a custom keybinding using c:c, and now when I open 
DrRacket, I get the error:
<<Error when installing the keybindings 
/home/dimaugh/prog/rkt/keybindings.rkt:
map-function in keymap%: "c:c" is already mapped as a non-prefix key>>

But after clicking the OK button I can use DrRacket, and Control+c works as 
it should.
The error message bothers me a bit, but other than that it's now solved.

On Sunday, 22 November 2020 at 16:49:38 UTC+1 Dimaugh Silvestris wrote:

>
> For some reason, Control+c isn't working in DrRacket, while Control+x for 
> cut and Control+v work as expected. I think I've had this since I installed 
> DrRacket, and I haven't changed anything about keybindings that I remember; 
> I've been using the right-click menu instead, but it's cumbersome and after 
> a while I've gotten sick of it. 
>
> In Edit->Keybindings->Show Active Keybindings it appears as "Copy (c:c)", 
> so I have no idea what could be causing this.
>
>

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