If you'd like to install Linux software from third-party repositories, you'll need to take care of one simple task first.
If you happen to own one of the many Chromebooks that can run Linux apps, you might have hit an issue that prevents you from installing applications from non-standard repositories. For example, say you want to add the Debian stretch repository. You attempt to run the command sudo apt-add-repository 'deb http://ftp.us.debian.org/debian stretch main contrib non-free', when you are presented with the error "apt-add-repository command not found."
What do you do? Do you stick with only software supplied by the standard repositories or do you fix the problem so you can install third-party software?
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Chances are pretty strong you'll want to install that third-party software, otherwise you might find yourself slightly limited. Let me show you how to make this work. Believe it or not, the fix is quite simple.
Log in to your Chromebook and open the Linux terminal window. Once the window opens, issue the command:
sudo apt-get install software-properties-common -y
Once that piece of software installs, issue the command to install the repository once again, and you should see no errors.
That third-party repository has been added and you can start installing software, once you run the command:
sudo apt-get update
Congratulations, your Chromebook world has just been opened up to a deluge of possible software.
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