You can update your system with unsupported packages from this untrusted PPA by adding ppa:stellarium/stellarium-releases to your system's Software Sources.
If you're using the most recent version of Ubuntu (or any version from Ubuntu 9.10 onwards), you can add a PPA to your system with a single line in your terminal:
sudo add-apt-repository ppa:stellarium/stellarium-releases
sudo apt-get update
sudo apt-get install stellarium
This PPA can be added to your system manually by copying the lines below and adding them to your system's software sources.
deb http://ppa.launchpad.net/stellarium/stellarium-releases/ubuntu maverick main deb-src http://ppa.launchpad.net/stellarium/stellarium-releases/ubuntu maverick main
- Signing key:
On older (pre 9.10) Ubuntu systemsStep 1: Visit the PPA's overview page in Launchpad. Look for the heading that reads Adding this PPA to your system and click the Technical details about this PPA link.Step 2: Use the Display sources.list entries drop-down box to select the version of Ubuntu you're using.Step 3: You'll see that the text-box directly below reads something like this:
deb http://ppa.launchpad.net/gwibber-daily/ppa/ubuntu jaunty main deb-src http://ppa.launchpad.net/gwibber-daily/ppa/ubuntu jaunty mainCopy those lines.Step 4: Open a terminal and type:
sudo gedit /etc/apt/sources.listThis will open a text editor containing the list of archives that your system is currently using. Scroll to the bottom of the file and paste the lines you copied in the step above.Save the file and exit the text editor.Step 5: Back on the PPA's overview page, look for the Signing key heading. You'll see something like:
1024R/72D340A3 (What is this?)Copy the portion after the slash but not including the help link; e.g. just
72D340A3.Step 6: Now you need to add that key to your system so Ubuntu can verify the packages from the PPA. In your terminal, enter:
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 72D340A3Replace
72D340A3with whatever you copied in the step 5.This will now pull down the PPA's key and add it to your system.Step 7: Now, as a one-off, you should tell your system to pull down the latest list of software from each archive it knows about, including the PPA you just added:
sudo apt-get update