Today, when I was about to shut down my laptop, I received a confirmation that a system update had been downloaded and was ready to be installed upon rebooting. I chose to install the update and clicked the Shutdown button. However, after a few minutes, the progress bar got stuck at 50%, and the CapsLk indicator start blinking which indicate kernel panic.
To diagnose a panic, a feature called kdump is available which uses a second Linux kernel running in a reserved region of memory to save a core dump of the failed kernel for analysis. https://unix.stackexchange.com/questions/3840/the-caps-lock-and-scroll-lock-lights-are-flashing-and-everything-is-frozen