Setting up a usb serial port as a server console

[Jeffrey Walton]

On Sun, Jun 15, 2025 at 12:41 AM Robert Moskowitz via ubuntu-users
<ubuntu-users at lists.ubuntu.com> wrote:
>
> Now that I have 2 Ubuntu servers up and running on boxes without serial
> ports, I am concerned how I would gain access if SSH is hosed (where
> they are is not practical to hook up a kybd/monitor).
>
> I was thinking to get a USB nul-modem cable:
> [...]

Forgive my ignorance... Under what circumstance can you attach a USB
null modem cable, but not a USB mouse and keyboard (maybe using a USB
hub)?

Jeff