I've installed x2goserver & x2goserver-xsession on ubuntu servers in the past and then access that server via an x2go client 
and it worked fine without installing a full Desktop Environment although its a bit sparse :-)


On Thu, Feb 28, 2019 at 6:18 PM Robert Dinse <nanook@eskimo.com> wrote:

      Ok if you're expecting a display as if you had a head on a local machine
you need a desktop environment.  Granted you can do other things without but
then you can do that with ssh -X so why bother?

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On Thu, 28 Feb 2019, Stefan Baur wrote:

> Date: Thu, 28 Feb 2019 23:41:40 +0100
> From: Stefan Baur <X2Go-ML-1@baur-itcs.de>
> To: Robert Dinse <nanook@eskimo.com>
> Cc: x2go-user@lists.x2go.org, Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
> Subject: Re: [X2Go-User] x2go and Ubuntu 18.04 server
>
> Am 28.02.19 um 23:33 schrieb Robert Dinse:
>
>>      You need a desktop environment.  If you are using the default gnome,
>> then you also need gnome-flashback-session.  Else install mate which works
>> perfectly with x2go.
>
> No, you don't.
>
> The fact that you can start a script, have the script start xterm in the
> background, and then virt-manager clearly proves your statement wrong.
>
> -Stefan
>
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