These instructions are for 12.04 and 12.10. As you have 12.10, the best option is to get the developers to add a PPA for 12.10; but in the short term, I have included a workaround here.

1. Go to the guide page that you indicated.


2. Download the installation script for Ubuntu. (If you just click the link, you may get a text file in your browser, which is no good. Rather right-click the link and select Save Link As…)


3. For 12.10 only, do these additional steps:
   
   
   
   • Edit the file that you downloaded. The easiest way is to open Text Editor and open the downloaded install-esteid-ubuntu.sh from there.
   
   
   • Line 5 starts with OPSYS=.
   
   
   • Underneath line 5, add the following line:
     
     OPSYS=precise
   
   
   • Save the file and close the text editor.
   
   


4. Open a Terminal by pressing Ctrl+Alt+T.


5. Change to the folder where you saved the file; for example, cd Downloads.

Enter the following commands into the terminal (i.e. type the first command, press Enter, then type the second command, press Enter. You can use the mouse to cut-and-paste the commands to save typing errors). The second command will prompt for your password.

chmod +x install-esteid-ubuntu.sh

sudo ./install-esteid-ubuntu.sh

When prompted, Do you want to continue [Y/n]?, type y and press Enter.

Once the script has finished running, press Ctrl+D to close the window. The application is installed, and you will find it in your menu.