I have found this not only happens with x2go but also with nx and vnc
and I believe it has to do with systemd sessions.

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On Fri, 19 Jan 2018, Ulrich Sibiller wrote:

Date: Fri, 19 Jan 2018 21:20:10 +0100
From: Ulrich Sibiller <[email protected]>
To: Robert Dinse <[email protected]>
Cc: RW <[email protected]>, x2go users <[email protected]>
Subject: Re: [X2Go-User] x2go local desktop connection on rpi

On Fri, Jan 19, 2018 at 3:45 PM, Robert Dinse <[email protected]> wrote:

     This is I think an issue with Ubuntu, it won't allow two graphical
logins
from same user on same machine, but if you originate with a different UID
than you connect with it is okay.

The relevant information is probably in the server side session log
(/tmp/.x2go-<username>/C-<username>-<displaynum>.*/session.log. You
should find the reason why the connect did fail.

I would also suggest switching to nx 3.5.99.13 which offers the
tolerancechecks (see man nxagent) option to make reconnects possible
where 3.5.0 simply does not allow them. Here's how:
https://wiki.x2go.org/doku.php/doc:howto:nx-libs-betatesting

You'd have to suspend your session, then edit
/tmp/.x2go-<username>/C-<username>../options (add the
tolerancechecks=<yourvalue> option), then try to reconnect.

Uli

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