How to install FreeNX server and client on Ubuntu

1. Add the FreeNX team repo

     sudo add-apt-repository ppa:freenx-team

2. Install FreeNX

   sudo apt-get update && sudo apt-get install freenx

3. Apply Patch

   wget https://bugs.launchpad.net/freenx-server/+bug/576359/+attachment/1378450/+files/nxsetup.tar.gz && tar xvf nxsetup.tar.gz && sudo cp nxsetup /usr/lib/nx

4. Setup NoMachine keys

     sudo /usr/lib/nx/nxsetup --install --setup-nomachine-key

5. Import public key for server

   sudo cp /usr/NX/etc/keys/node.localhost.id_dsa.pub /tmp/node.localhost.id_pub.save
   sudo /usr/NX/bin/nxnode --keyadd /tmp/node.localhost.id_pub.save
   sudo  nx:root /usr/NX/bin/nxserver --keygen
   sudo chown nx:root /usr/NX/home/nx/.ssh/authorized_keys2
   sudo chmod 0644 /usr/NX/home/nx/.ssh/authorized_keys2
   sudo mv /usr/NX/home/nx/.ssh/authorized_keys2 /usr/NX/home/nx/.ssh/autohriazed_keys --

6.  Add new user using useradd, then add this username to /etc/ssh/sshd_config under AllowedUsers (multiple usernames can be specified with spaces separating the names)
7.  check if the user is ableto login to NXServer bu uisng command

   sudo /usr/NX/bin/nxserver --usercheck

8. Add the following  shell script to /usr/NX/bin/nxwrapper

   #!/bin/bash
   nxnode=${ps -o ppid= -p $PPID}
   nxagent=${pgrep -p $nxnode -u $USER -x nxagent}
   ${1+"$@"}
   exec kill $nxagent

9.   Import the key in /usr/NX/keys/rsa_id.pub.key on to client. use custom for desktop manager specify path to nxwrapper and specify startfluxbox

Fix for "Cannot shutdown using power button" on Ubuntu

After my recent upgrade to ubuntu, pressing the power button to shut down stopped working. I had to remap the script mapped to the power button by

1. Editing  /etc/acpi/events/powerbtn using the command
      sudo gedit  /etc/acpi/events/powerbtn
2. Commenting line shown below by adding a # to the beginning  of the line
      action=/etc/acpi/powerbtn.sh
3. adding a new line
      action=/sbin/poweroff
4. Saved and exited Gedit. Tested to make sure the functionality is restored by pressing the  power button to shut down