I changed the title of this thread. I believe this error message is the cause of the problem, but I don't know how to fix.

Right now, among the dozen Ubuntu 14.04 servers I run, half of them x2go works, and other half do not work.

all machines have applied the latest updates (x2go 4.1.0-1517 for the server components, 4.1.1.1-1719 for the client, and libnx-x11-6: 2:3.5.99.16-0)

I compared the package versions, I can't see any difference between the servers that x2go works vs those failed - all x2go/nx components have identical versions.

when connecting to the machine have problems, the server side log gives "Unable to open display 'nx/nx", full log see below.

this issue only happens in March after some x2go package updates.

please help!

Qianqian


On 04/10/2018 01:19 AM, Qianqian Fang wrote:

hi Mihai and other x2go users,

I am wondering if you have any further comments or suggestions, I am still unable to connect to more than half of my servers. All failed in the same messages:

On the client side:

Connection failed. Failed to start X2Go Agent session with ID fangq-...._stDXFCE_dp24. X2Go Agent terminated unexpectedly. Aborting session startup.

on the server side:

Info: Agent running with pid '4112'. Session: Starting session at 'Tue Apr 10 01:15:16 2018'. Error: Aborting session with 'Unable to open display 'nx/nx,options=/tmp/.x2go-fangq/C-fangq-...._stDXFCE_dp24/options:51''. Session: Aborting session at 'Tue Apr 10 01:15:16 2018'. Session: Session aborted at 'Tue Apr 10 01:15:16 2018'.

all updated with the latest version of Ubuntu 14.04

Qianqian

On 03/26/2018 10:46 PM, Qianqian Fang wrote:
On 03/26/2018 10:44 PM, Mihai Moldovan wrote:
Looks good, all old packages are in rc state (i.e., uninstalled, but not purged).

Sorry, that should have been ls -ldh /usr/lib/*86*/nx/X11/*

I'm interested in the files in there.

here you go

fangq@zodiac:~$ ls -ldh /usr/lib/*86*/nx/X11/*
lrwxrwxrwx 1 root root 20 Mar 17 08:41 /usr/lib/x86_64-linux-gnu/nx/X11/libX11.so.6 -> ../../libNX_X11.so.6
lrwxrwxrwx 1 root root 24 Mar 17 08:41 /usr/lib/x86_64-linux-gnu/nx/X11/libX11.so.6.3.0 -> ../../libNX_X11.so.6.3.0



Like the other user on the mailing list wrote, purging sessions can be done
using rm -vf /var/lib/x2go/x2go_sessions; x2godbadmin --createdb (both as root),
but if there are no sessions currently that won't do anything useful.

I see. are there other logs that I can find/provide to narrow down the issue?

thank you again for your help.

Qianqian


Mihai