So, you first ran bleachbit, and after that, you updated the system, right?
Have you enabled REISUB? If yes, then proceed as explained in that link.
If not, I guess you can try to reboot with key combination Ctrl-Alt-Del.
If nothing else helps, you may need to use the power switch as the last resort…
If you get your system running again, I’d recommend create a backup of all your personal data to an externla disk, just in case something unwanted has happened to the internal disk.