Beware that the following packages are not free but if you're facing problems with the freeNX packages, it may be a good solution:
Setting up Nomachine NX packages on Ubuntu is now quite easy:
- Launch Ubuntu desktop or the server edition and install ubuntu-desktop
sudo aptitude install ubuntu-desktop
Download the Nomachine NX packages for Ubuntu (http://www.nomachine.com/download) (versions as of 2011-07-25)
wget http://126.96.36.199/download/3.5.0/Linux/nxclient_3.5.0-7_i386.deb wget http://188.8.131.52/download/3.5.0/Linux/nxnode_3.5.0-3_i386.deb wget http://184.108.40.206/download/3.5.0/Linux/FE/nxserver_3.5.0-4_i386.deb
- Install the packages all at the same time: client, node, server
sudo dpkg -i nxnode_3.5.0-3_i386.deb nxserver_3.5.0-4_i386.deb nxclient_3.5.0-7_i386.deb
By default, the SSH key is a shared key amongst all NX clients. This is OK, but if you want added security, generate your own unique key as follows.
Caveat: You'll have to modify your NX client wherever you're connecting from to use the custom key.
- Import localhost key
sudo cp /usr/NX/etc/keys/node.localhost.id_dsa.pub /tmp/node.localhost.id_dsa.pub.save sudo /usr/NX/bin/nxnode --keyadd /tmp/node.localhost.id_dsa.pub.save
WARNING: Don't directly import the file /usr/NX/etc/keys node.localhost.id_dsa.pub. First copy it, otherwise it will be deleted after the importation).
- Regenerate new SSH key for NX user as the default is common for all others
sudo /usr/NX/bin/nxserver --keygen
- Change the owner of the nx user public key on the server
sudo chown nx:root /usr/NX/home/nx/.ssh/authorized_keys2
If you are going to use it with e.g. Amazon ec2, then NX's hard link between authorized_keys2 and the default.id_dsa.key will create problems when bundling AMIs.
sudo cp /usr/NX/home/nx/.ssh/authorized_keys2 /usr/NX/home/nx/.ssh/authorized_keys2.tmp sudo rm /usr/NX/home/nx/.ssh/authorized_keys2 sudo cp /usr/NX/home/nx/.ssh/authorized_keys2.tmp /usr/NX/home/nx/.ssh/authorized_keys2
Check that the name conforms to the filename given in the /etc/ssh/sshd_config file. With the default Ubuntu SSH setting this is not neccessary, but someone might have changed it to e.g.: authorized_keys
sudo chmod 0644 /usr/NX/home/nx/.ssh/authorized_keys2 sudo mv /usr/NX/home/nx/.ssh/authorized_keys2 /usr/NX/home/nx/.ssh/authorized_keys --
Additional Potential Steps for Consideration
SSH Password Login
- You might need to enable password login into SSH. We can do this by editing SSH configuration:
sudo vi /etc/ssh/sshd_config
- Configure the following values:
PasswordAuthentication yes UsePam yes
SSH Allow NX
If you have restricted SSH with AllowUsers you need to add nx to the list:
AllowUsers nx ''youruser'''
- It may be necessary to remove a line in SSH's your known host file for your user on the server, or remove it all together(reset it):
sudo rm /home/$USER/.ssh/known_hosts
- Restart services
sudo /etc/init.d/ssh restart sudo /etc/init.d/nxserver restart
- Check if your user will work:
sudo /usr/NX/bin/nxserver --usercheck ''youruser''
- Install the client on your local machine.
Start it either via Applications/Internet/NX Client for Linux/NX Connection Wizard or via cmd line;
/usr/NX/bin/nxclient --wizard &
- Enter the hostname and so on till you get prompted for login.
- Enter your username and password.
- Import the new nx key by:
Downloading the new DSA key from the server:
scp ''SERVERNAME'':/usr/NX/share/keys/default.id_dsa.key \ ''SERVERNAME''.id_dsa.key
Then click on Configure..., then Key under General and then on Import.
Find the file ''SERVERNAME''.id_dsa.key and click save, save then Ok.
- Login should now hopefully work....