Definitely don’t type that.
Try sudo -su rm -R /|yc...if you really want to “reboot” your OS.
I just use the power button. Click once to open shut down menu and choose Shut Down or Reboot. I could add Hibernate, Suspend, Lock Screen and Logout to the menu but I don’t use them. If I do want to reboot from the terminal, I type reboot
Weird ha?