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GRUB Rescue and Repair on Linux | Rescue and Restore Your Bootloader! (Ubuntu)
Any operating system can crash, including Ubuntu. If you are using Linux and are having a problem, here are a few reasons and solutions to help you get out of your crash.
If Ubuntu crashes, the first thing you can try is to reboot your system. Sometimes you need to perform a cold boot. Shut down your computer and then restart it. Rebooting your computer fixes many issues such as low memory, application crashes, and browser crashes.
Make a note of what you were doing just before the crash. If it always happens when using a specific application, check for updates or known issues. Some applications are known to crash sometimes, such as Audacity and OpenShot Video Editor.