Install FreeNX on Ubuntu Server

installation.txt

sudo apt update && sudo apt -y upgrade
sudo apt install software-properties-common python-software-properties 
sudo apt update
sudo apt-add-repository -y ppa:x2go/stable ppa:freenx-team/ppa ppa:ubuntu-mate-dev/ppa ppa:ubuntu-mate-dev/trusty-mate
sudo apt update
sudo apt install install gnome-session-fallback mate-desktop-environment-extras freenx freenx-server
 
# download the installation script
wget https://bugs.launchpad.net/freenx-server/+bug/576359/+attachment/1378450/+files/nxsetup.tar.gz
 
# Extract the script and copy it to the NX directory
sudo tar -xvf nxsetup.tar.gz
sudo cp nxsetup /usr/lib/nx/nxsetup
 
# Run the installation script
sudo /usr/lib/nx/nxsetup --install 
# the script will prompt you
------> It is recommended that you use the NoMachine key for
        easier setup. If you answer "y", FreeNX creates a custom
        KeyPair and expects you to setup your clients manually.
        "N" is default and uses the NoMachine key for installation.
 
Do you want to use your own custom KeyPair? [y/N]
 
# I would say yes for security reason, because it will generate a 
# rsa key that you need to specify to your client in order to get 
# connected to Freenx. But this is your choice.
 
# If you choose to go this way it will generate a rsa key in 
sudo cat /var/lib/nxserver/home/.ssh/client.id_dsa.key

Client Configuration
Now it is time to connect remotely to your Ubuntu desktop. You should download the NoMachine NX client You can find other solutions but that one works fine. When installed create a new session with your computer information. The only specific configuration is to ensure you choose Gnome desktop and that you specify the key generated previously by the nxsetup script.

# if you choose to generate a seperate key for freenx,
# find out what is your key by issuing this command
sudo cat /var/lib/nxserver/home/.ssh/client.id_dsa.key