Ubuntu server 12.04 LTS gnome classic

After server version installed:

gnome2, classic, fallback installation on server-version

sudo apt-get update
sudo apt-get install gnome-core gnome-session-fallback

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Ambiance and Radiance themes

sudo add-apt-repository ppa:webupd8team/themes
sudo apt-get update
sudo apt-get upgrade

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install GNOME Classic (No effects)

sudo dpkg -i nxclient_3.5.0-7_amd64.deb
sudo dpkg -i nxnode_3.5.0-9_amd64.deb
sudo dpkg -i nxserver_3.5.0-11_amd64.deb

edit the node configuration file (namely /usr/NX/etc/node.cfg) to have:

DefaultDesktopCommand "/usr/bin/gnome-session --session=gnome-fallback"

and:

CommandStartGnome "/usr/bin/gnome-session --session=gnome-fallback"

Notes for 3.5.0 users

Set in the node configuration file:

CommandStartGnome = "/usr/bin/gnome-session --session=gnome-fallback"

https://www.nomachine.com/AR07K00676