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, for the client, and libnx-x11-6: 2:

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!


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


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 
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.



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