NoMachine Workstation: new virtual desktop fails

[drichman]

I’m trying NoMachine Workstation Evaluation 6.10.12 on Ubuntu 16.04 LTS, connecting to it with 6.10.12 on Mac OS X (Catalina, 10.15.4), and testing the ability to connect to different user accounts on this shared Ubuntu workstation.

When I connect to an account that is currently active and displaying on the Ubuntu machine, I see the option to launch the physical display, and it works fine.

When I connect to an account that’s not active, and can be logged in or not, I see the options to create a new virtual desktop or create a new custom session, and I try to create a new virtual desktop. It opens a black screen for a few seconds and then kicks be back to the connection screen.

If I switch the active account at the Ubuntu machine it’s the opposite–in other words, I can remotely launch the physical desktop of the account that’s displaying but not the virtual desktop of an account that’s not displaying.

I tried these solutions to no effect:

https://www.nomachine.com/TR03M05061 (Black screen occurs when connecting virtual desktops on Ubuntu 14.04)

https://www.nomachine.com/AR09L00814 (A black screen is displayed when running virtual desktops on Unity 3D or GNOME 3 and proprietary drivers)

I reproduced the problem while taking debug-level logs on server-side, please find attached. Thanks for your help.

Attachments:

1. NoMachine-log.tar-1.gz
2. NoMachine-log-client.tar.gz

[shiba]

Hi!

We cannot reproduce such problem on the fresh installed Ubuntu 16.04 with default UNITY. Could you tell what graphical environment are you using? Please give us the output of

/usr/share/xsessions

Could you also check what is your DefaultDesktopCommand in /usr/NX/etc/node.cfg

We have:
DefaultDesktopCommand “/etc/X11/Xsession ‘gnome-session –session=ubuntu'”

Please check our article https://www.nomachine.com/AR04K00667

[drichman]

Contents of /usr/share/xsessions:

-rw-r–r–   1 root root   204 Aug 22  2016 ubuntu.desktop

Based on the article, section 2.1, I checked:

grep ^Exec /usr/share/xsessions/ubuntu.desktop

Exec=gnome-session –session=ubuntu

And from node.cfg:

DefaultDesktopCommand “/etc/X11/Xsession ‘gnome-session –session=ubuntu'”

and I checked that it’s not commented out.

Do you think I need to pursue one of the approaches in the article, like installing a different environment globally or per-user?

Thanks again!

[shiba]

Could you check again with this command?
DefaultDesktopCommand "/etc/X11/Xsession ‘gnome-session --session=ubuntu'"

If that doesn’t help, send us logs from server side. Please find the instructions here: https://www.nomachine.com/DT10O00163#1. You can send them to forum[at]nomachine[dot]com

[Britgirl]

drichman, we received your logs, thank you. Unfortunately, you didn’t enable debug before reproducing the problem.

https://www.nomachine.com/DT10O00163#1.1

Please enable debug as per the instructions on the server-side, reproduce the problem, gather the logs and then send them to us as you did before.

[shiba]

We’ve received and analyzed your logs. It appears to be more of system configuration problem and not one caused by NoMachine. We’ve also tried to reproduce the problem on a fresh Ubuntu 16.04 just to make sure, but without success.

You should check possible error messages in the user’s home directory ‘.xsession-errors’ file and system logs. Reinstalling of your GUI environment is also worth considering.

[Author]

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