You have probably noticed after your fresh install of Ubuntu that there may be a icon indicator in the upper right corner (Gnome) of your screen. This is the system updates available indicator and it’s there to let you know it’s time for an update. To update your system all you have to do is click on it and enter your password and just follow the instructions provided. (Basically click next or okay to progress through the installation). Once it’s done your system is updated with the latest software updates and security patches.