Re: unable to map C-_ to undo in wsl ubuntu emacs

[Eli Zaretskii]

> From: Sivaram Neelakantan <nsivaram.net@gmail.com>
> Date: Fri, 10 Sep 2021 11:52:12 +0530
> User-Mail-Address: nsivaram.net@gmail.com
> 
> > Could be a real problem with that terminal.  What does "showkey -a"
> > display for C-_ on that terminal?
> >
> >
> 
> $ showkey -a
> 
> Press any keys - Ctrl-D will terminate this program
> 
> ^M       13 0015 0x0d
> ^M       13 0015 0x0d
> ^D        4 0004 0x04

So that's a real problem with that terminal, please report it to the
appropriate issue tracker.  There's nothing Emacs can do about such a
strange remapping of keys, and rebinding RET to a different function
in Emacs will wreak havoc much worse than what you have now.

I suggest to learn to use "C-x u" instead, for now.