bug#55443: emacs-28.1: tramp sudo broken

[Remco van 't Veer]

After upgrading from emacs-27.2 to emacs-28.1 on a Guix system, opening
files/directories via sudo using tramp no longer works.

Here's what's in the *Messages* buffer:

> Tramp: Opening connection nil for root@remq240 using sudo...done
> File error: Couldn't find a proper `ls' command [6 times]
> tramp-error: Couldn't find a proper `ls' command

I am at:

> Generation 48 May 15 2022 16:38:54    (current)
>   guix 9860c90
>     repository URL: https://git.savannah.gnu.org/git/guix.git
>     branch: master
>     commit: 9860c90e8e5362e0e843efbd45f4563b9746a196

Logging out after upgrade does not help.

Kind regards,
Remco