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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: unable to map C-_ to undo in wsl ubuntu emacs
Date: Mon, 06 Sep 2021 18:37:31 +0300
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In-Reply-To: <85eea1df5a.fsf@gmail.com> (message from Sivaram Neelakantan on
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> From: Sivaram Neelakantan <nsivaram.net@gmail.com>
> Date: Mon, 06 Sep 2021 18:39:37 +0530
> User-Mail-Address: nsivaram.net@gmail.com
> 
> I've got Emacs-27.2 running in Emacs -nw and when I do C-_, I get RET
> which I confirmed by C-h k "RET runs the command newline (found in
> global-map)... compiled lisp function in 'simple.el'"

What terminal emulator are you using?  Does that terminal emulator
have some settings, where perhaps you can configure what it sends
given a certain control key?