zPanel provides an installer for Ubuntu 12.04 that you can on their site. The following process can be used to install zPanel on a newly created Ubuntu 12.04.5 x64 droplet:
1.) ssh into your droplet as the root user.
2.) Download the zPanel installer.
wget https://raw.github.com/zpanel/installers/master/install/Ubuntu-12_04/10_1_1.sh
3.) Make the script executable
chmod +x 10_1_1.sh
4.) Run the installer and follow the on-screen prompts
./10_1_1.sh
The install will download and install many new packages and may also update your droplet's kernel. If it does you will need to ensure you select the appropriate kernel image in the control panel.
Just to point one thing here, zPanel project was sold and the team then took the code and moved onto new project called sentora..
So if anyone is planing to deploy zPanel, its better to head down to sentora since project has been moved to sentora !!
For further details about this, do read their website, http://sentora.org/