Updating to latest ubuntu version
Repositories that are not designed to work with your version of Ubuntu can introduce inconsistencies in your system and might force you to re-install.
In order to add a repository you need its "location" and the "key command" (the command that will add the repository's key to your system).
This interface can be accessed via several methods.
One method is to go through the "Ubuntu Software Center".
To upgrade Docker CE, download the newer package file and repeat the installation procedure, pointing to the new file.Note: The fastest server now may not be the fastest server at another time.The "Other Software" tab is where you can enable Canonical Partner Repositories.Once you know the key hash, the key can be retrieved using the command: Ubuntu Software Center is the GUI-based method to add or remove applications.It allows the user to selectively choose the repositories to be searched and then presents a list of applications with a brief description of each application.