It seems that 'loginctl linger' does not work anymore as an ordinary user on Fedora 27. This worked on Fedora 26.
From: https://bugzilla.redhat.com/show_bug.cgi?id=1478974#c15
On Fedora 27 it seems that enable-linger does not work as an ordinary user which is required for x2goserver keep sessions alive.
Inside an x2go session:
$ loginctl enable-linger Failed to look up user 62: No such process
and (as root) "loginctl show-user ngaywood" shows:
Linger=no
As root I can:
loginctl enable-linger ngaywood
and Linger will be set.
This used to work in Fedora 26
x2goserver-4.0.1.22-0.0x2go1.1.git20180204.1197.main.fc27.x86_64
-- Norman Gaywood, Computer Systems Officer School of Science and Technology University of New England Armidale NSW 2351, Australia
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