[X2Go-User] X2Go server, nxagent causes segfault

[Kalle Tuulos]

Hello

I'm using X2Go server in several computers, all running Ubuntu. Just today,
one of my computers (headless Linux box) just froze and I had to give it a
power cycle reset. After powering up again, I can't any more connect to
X2Go.

I'm getting following into /var/log/syslog:
---8<---8<---
Mar 12 13:15:40 kallebuntu systemd[1]: Started Session 10 of user ktuulos.
Mar 12 13:15:49 kallebuntu /usr/sbin/x2gocleansessions[1091]:
ktuulos-50-1520853345_stDLXDE_dp32: state file for this session does not
exist: /tmp/.x2go-ktuulos/C-ktuulos-50-1520853345_stDLXDE_dp32/state (this
can be ignored during session startups)
Mar 12 13:15:51 kallebuntu /usr/bin/x2gostartagent: successfully started
X2Go Agent session with ID ktuulos-50-1520853345_stDLXDE_dp32
Mar 12 13:15:58 kallebuntu kernel: [ 1315.845394] nxagent[9647]: segfault
at 8 ip 000056286f70db3a sp 00007ffea2bd1bc0 error 4 in
nxagent[56286f693000+432000]
Mar 12 13:16:04 kallebuntu /usr/bin/x2gosetkeyboard: Setting X keyboard
according to
/home/ktuulos/.x2go/C-ktuulos-50-1520853345_stDLXDE_dp32/keyboard
Mar 12 13:16:05 kallebuntu /usr/bin/x2goruncommand: launching session with
Xsession-x2go mechanism, using STARTUP="startlxde"
Mar 12 13:16:05 kallebuntu /usr/bin/x2goruncommand: dbus wrapper available
as /usr/bin/dbus-run-session
---8<---8<---

This computer is running Ubuntu 16.04. X2go server has been installed using
the ppa method.
---8<---8<---
ktuulos at kallebuntu:~$ uname -a
Linux kallebuntu 4.13.0-36-generic #40~16.04.1-Ubuntu SMP Fri Feb 16
23:25:58 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
ktuulos at kallebuntu:~$ dpkg -s x2goserver | grep Version
Version: 4.1.0.0-0~1517~ubuntu16.04.1
ktuulos at kallebuntu:~$ cat
/etc/apt/sources.list.d/x2go-ubuntu-stable-xenial.list
deb http://ppa.launchpad.net/x2go/stable/ubuntu xenial main
# deb-src http://ppa.launchpad.net/x2go/stable/ubuntu xenial main
---8<---8<---

There seem to be no hardware problems - I installed mcelog and I'm now
monitoring its output. Nothing.

Could anyone give some hints? I have spent the last hour googling about
"nxagent segfault", but I haven't found anything, which would help.

Thanks,
  Kalle
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