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Try the workaround available here:
A black screen is displayed when running virtual desktops on Unity 3D or GNOME 3 and proprietary drivers
From the message you’re getting, NXWmRunningHelper: WARNING! Failed to open display ‘:0′, it looks like you’re attempting to connect to the physical display (and not virtual desktop sessions). We are not aware of similar problems. Ideally, we’d need to see the logs of both client and server to be able to understand why this specific user has trouble connecting. Please refer to the article about extracting logs and send them to forum[at]nomachine[dot]com. https://www.nomachine.com/DT07M00098.
If you wish to install any of the NoMachine packages from command line, for example because you are installing from remote by SSH or similar tool, please read the instructions here: https://www.nomachine.com/AR01L00775.
The desktop environment you have running there, whether it’s XFCE or any other Linux DE amongst the tens of variations available, doesn’t matter to NoMachine.
We consider physical desktops all desktops that are either really physical (in the sense that they are running on physical hardware) or that are running as physical desktops inside a virtual machine. Any of our server products perfectly fit this scenario, and that includes the free version which permits access to the physical display.
Your screenshot shows KVM running Debian instances, but these virtual machines could be any of the other supported operating systems, so Windows and Mac, running inside VMware, Xen, among others and even in a Docker container. You configure and run NoMachine inside such VM instances as you do on a physical computer.
The question here is not a technical one, rather a licensing one. The free version is for individual use (and that can be in a private or work environment). Section 2. GRANT OF LICENSE AND TERMS OF USE of the EULA is quite clear about how it can and can’t be used. https://www.nomachine.com/licensing-5. If your scenario doesn’t fit into the use cases that we describe in a) and b), I suggest you contact the sales team to get further guidance. Click Contact Us in the footer of the website and select Sales Enquiries.
Packages 5.0.63 are now available.
Here is our software update announcement: https://www.nomachine.com/SU04N00100
To connect from Windows to Linux, you will need to install NoMachine on the Windows PC (client) and NoMachine on the Linux host (the machine you are connecting to). Please follow the illustrated Getting Started Guide here: https://www.nomachine.com/getting-started-with-nomachine
We have inserted a new Feature Request: https://www.nomachine.com/FR01N03001
This will let you specify a range of displays allocated to connections to the physical desktop.
Can you tell us if you are experiencing the same problem with version 5? If so, please follow the instructions here https://www.nomachine.com/DT04M00076 and send them to us as you did before.
We’ve not had any further news, so what we suggest is to reinstall from scratch and let us know if you are experiencing the same issue.
This has been open for some time and we have not heard back. Please download and install (or use the automatic updates) the latest version and let us know if you are still encountering the problem. Thanks!
We’ve sent you an email with a link to a debug package. We’ll need logs from the var/log directory including the nxerror.log. Follow the instructions here: https://www.nomachine.com/DT07M00098
Everything you need to know about the benefits of NX over SSH are here: https://www.nomachine.com/AR11K00739