Of all the errors messages and problems I have encountered over the years with Linux, there are few that I found more frightening than this one:
No such device: UUID=ca40b0c0-3068-4808-bea2-9b439d31e1c2
Grub Rescue >
Even with a kernel panic, your system at least started to boot, but when you get hit with the “Grub Rescue” prompt, it means your system could not even get past the bootloader. Nevertheless, as scary as it feels to suddenly have no access to anything on your computer, it is actually fairly easy to fix.