Ubuntu :: Can't Connect To VPS Server Via NX Client

I bought VPS Linux server, but i would like remote desktop thought NX Client. Firstly I installed on server ubuntu like this:

Code:

gpg --keyserver keyserver.ubuntu.com --recv-keys 493B3065 && gpg --export -a 493B3065 | sudo apt-key add -
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install kubuntu-desktop

Then I proceed as described in this tutorial:

Code:

[URL] but it's not work when I try loging to the server via NX Client. Then I try this tutorial:

Code:

[URL] but I don't receive public key (when I put this code sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 2a8e3034d018a4ce) .