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.
This use a script with all the required command to setup the repository, If you prefer to do it the manual way please look at the Debian instruction.

1. Copy and paste this command to a terminal to install the Skychart repository:

   bash <(wget -qO- https://raw.githubusercontent.com/pchev/skychart/master/setup_skychart_deb.sh) 

   Be sure to select the Beta version if you install on a recent distribution.
   At this point you can install the program using the Software Center or continue using the command line with the instruction below.

2. Update repository:

   sudo apt update

3. Install Skychart :

   sudo apt install skychart

4. If you want to show artificial satellites also do:

   sudo apt install wine

5. Launch Skychart from the system menu or from a terminal:

   skychart

   Please never run skychart as root or with sudo.

6. The program starts up, it takes several seconds to initialize, set your location and display preferences.
7. To install more data from different star and DSO catalog, use the menu Update / Install object catalog.
8. See the quick start guide for more information about the different use of the program.

The update for a new version is done at the same time as the standard update for the other software of your distribution, normally once a week on Monday for the unstable release.

Other software you can install from this same repository are:

ccdciel
eqmodgui
indistarter