How to install NX Free Edition on Ubuntu 12.04 Precise Pangolin

Screenshot of NX client connection to Ubuntu 12.04 with NX Free
Ubuntu GNU/Linux comes pre-loaded with the capability to remotely connect to the graphical desktop of your machine by means of a "Desktop Sharing" utility based on the VNC protocol. Clients can connect with a VNC viewer, i.e., tightvnc, vncviewer, etc.

While this may be a viable option for others, VNC has a few drawbacks that sent me looking for something a little more suited for my situation. Namely, I needed a speedy connection, and security.

One problem with VNC is that it's a non-encrypted and therefore non-secure protocol. The workaround for this is to configure the server to tunnel VNC client connections through SSH sessions. Unfortunately, doing this requires extra configuration on both the server and the client.

Another problem with VNC (at least one that I've experienced) is the laggy connections, which can make the user experience less than optimal. So in my search for a better alternative, I found "NX Free Edition" by
NX Free Server delivers the X Window session to clients via the encrypted SSH (Secure Shell) protocol, and it does it much faster and snappier than my experience with VNC. The only drawback of NX Free Edition is the license, as it is proprietary..

Although "NX Free" edition is said to be "free forever". Looking at the license file in the .deb package, it appears there are a number of GPL-covered items there, and then some items with the proprietary license. Checkout the license for NX Free for yourself here.

On the subject of NX servers, there is a FreeNX server PPA for Ubuntu 12.04(and other LTS versions), it's named ppa:freenx-team . Unfortunately, at the time of this writing, the packages from the ppa:freenx-team didn't seem to work properly for me. There was some error message concerning the esound dependency package not being available for install.

So, instead of FreeNX, we'll install NX Free Edition with the provided .deb installers instead. I used the 64-bit versions in my tests. Apparently, the big difference between 'FreeNX' and 'NX Free Edition' is that FreeNX is wholly FOSS and has no connection limits whereas the NX Free Edition is only partially FOSS and is limited to 2 client connections (according to the license page at the link above).

Before installing the NX Free Edition pacakages from:, first install the openssh-server package from the Ubuntu repositories.

sudo apt-get install openssh-server

After the pre-requisite has been installed, download and install the 3 NX Free Edition components from the "NX Free Edition for Linux" section at ( packages are installed in this order: client / node / server). Example:
sudo dpkg -i nxclient_3.5.0-7_amd64.deb
sudo dpkg -i nxnode_3.5.0-7_amd64.deb
sudo dpkg -i nxserver_3.5.0-9_amd64.deb

As for the connection to the NX Free Edition server, simply download the client from that works with your platform. There are versions for all 3 of the Major operating systems available.

As of this writing, the regular Ubuntu session provided by NX Free server doesn't quite work as expected . Not to worry, the 'ubuntu-2d' session does work well. I'm working on getting the appropriate server-side configuration for this so the setting won't be required at the client, but in the mean time, the workaround is to configure the NX Free client Session setting as follows:
Application > "Run the following command": gnome-session --session=ubuntu-2d

Options > Enable 'New virtual desktop'

That's it. NX Free Edition works great and it's one solution to the problem of needing more security and speed over the default VNC client in Ubuntu GNU/Linux. Here's a screenshot of the client connection.

Feel free to leave your comments below. If you are using Ubuntu 11.10 and are having problems with Unity at the client, see this link for the workaround. For more information concerning FreeNX on Ubuntu, see this link.

Looking for the FreeNX Server installation instructions? See my post "How to install FreeNX on Ubuntu 12.04 Precise Pangolin" instead. Cheers!

Shannon VanWagner