Update-manager is a frontend for the apt package management system. It allows you to perform some actions of the command line tool apt-get in a graphical interface. Developed by Michael Vogt
License: Open Source
SUMo is a comprehensive update manager that supports third-party applications and offers advanced features like version rollback and system clean-up, making it suitable for users who want detailed control over their software updates. In contrast, Ubuntu Update Manager is a simpler tool focused on managing system updates for Ubuntu, providing a more integrated experience but lacking the extensive features found in SUMo.