On 21.02.2025 03:29, Jeffrey Walton wrote:
...

     sudo    ALL=(ALL:ALL) ALL

I've rebooted the machine twice. I know the failure is not due to
stale login information.

Does anyone know why I cannot use sudo in this case?

Jeff

Your line misses % for some reason.
sudo in your case is the name of an user, not group.
It has to look like this:
    %sudo   ALL=(ALL:ALL) ALL

--

 With kindest regards, Alexander.

 Debian - The universal operating system
 https://www.debian.org

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