Bellow installation procedure uses only command line approach, because this is the simpler way to follow instructions just by copy-pasting the commands in terminal. This instructions are tested with the currently supported versions of Ubuntu.

1. Add Patrick Chevalley's signature to APT:
   

   sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 8B8B57C1AA716FC2

2. Add Skychart repository:

   sh -c "echo deb http://www.ap-i.net/apt stable main > /etc/apt/sources.list.d/skychart.list" 

   If you want more frequent update with the development version do:

   sh -c "echo deb http://www.ap-i.net/apt unstable main" > /etc/apt/sources.list.d/skychart.list" 

3. Update repository:

   sudo apt-get update

4. Install Skychart without full dependencies (does not install the packages required for the Artificial Satellites display, you can install them later):

   sudo apt-get install --no-install-recommends skychart

5. This is all software you need to install if sky will be observed with naked eye. But if you like to see some deep-sky objects (e.g. galaxies) and stars that are not seen with naked eye then install additional packages (this will download several MB of additional software):

   sudo apt-get install skychart-data-stars skychart-data-dso skychart-data-pictures

6. Launch Skychart from terminal:

   skychart

   You will also find the Skychart button in the main menu.

7. The program starts up, it takes several seconds to initialize, click Next button.
8. Observatory window opens. You need to tell the program from which location you will be observing the sky. You can select your observation place by clicking on Observatory database and select the city you are observing from. If the city is not included on the observatory database list you can download more details for your country, or you can manually enter Latitude, Longitude and Altitude information from the main Observation window. Search this information from e.g. web page: http://www.findlatitudeandlongitude.com/
9. That is it. Program starts. Try to click one of the buttons on the right sight N (North), S (South), E (East) or W (West) to get sky image on screen like it is in the nature. See the quick start guide for more information about the different use of the program.