Here's a quick tutorial showing how to download GitHub Desktop on your Ubuntu computer!
sudo wget https://github.com/shiftkey/desktop/releases/download/release-2.6.3-linux1/GitHubDesktop-linux-2.6.3-linux1.deb
If you don't already have gdebi-core installed, install it by running the following command:
sudo apt-get install gdebi-core
then run the following command to finish the desktop installation:
sudo gdebi /home/your_username/GitHubDesktop-linux-2.6.3-linux1.deb
Confirm installation by opening up your applications and searching for GitHub Desktop
Open the application and log in using your GitHub credentials!