> On 31 Aug 2021, at 21:40, Luciano Mannucci <luciano@???> wrote:
>
> On Tue, 31 Aug 2021 18:41:42 +0900
> Olaf Meeuwissen <olaf@quark> wrote:
>
>> As g4sra said, /run/user/xxx is used by session management and as you
>> say you have Xorg running on one of the machines, I guess someone is
>> logged in and running an X session. That would normally trigger
>> creation of /run/user/xxx.
> Well, not really.
>
> I've completely removed Xorg, rebooted the machine, and still it does
> the same: when I log in as user XXX via ssh I see a /run/usr/XXX on
> that machine. I'm still investigating...
>
> Thanks for your answer,
>
> Luciano.

Perhaps elogind or consolekit is creating this if you have either installed? They will manage the login sessions.