No operating system will run without encountering a problem. This isn’t to say all operating systems are inherently flawed which allows an error to render them unusable, but through installing, removing, and using additional software, things can (and often do) go wrong. During day-to-day use of a Linux distribution such as Ubuntu, you might come across an issue with your installation. It could be because Ubuntu is not booting correctly, or maybe a specific driver for something like your keyboard, mouse, or even the soundcard is malfunctioning.