This is a photograph of an information display in the London Underground. This one is running Linux apparently, a file-system is missing and when the system boots it cannot find the file-system and this results in the system switching to runlevel 6 and rebooting. Someone might have stolen a hard drive from a machine and this results in the Linux machine failing to boot. So if you have a Linux machine, make sure the physical access to the server is restricted to avoid security issues. This is yet another Linux sighting.