REISUB is a safe way to reboot a frozen Linux system, allowing you to restart without file system corruption. It acts as the linux version of 'Ctrl + Alt + Del' on windows.
Hold Alt and SysRq (Print Screen). While holding them, press R, then E, then I, then S, then U, then B. Wait
about one second between each key.
Print Screen/SysRq on a standard english keyboard
- R gives keyboard control back to the kernel.
- E asks all programs to terminate cleanly.
- I force-kills any remaining programs.
- S writes all cached data to disk.
- U remounts filesystems as read-only.
- B immediately reboots the system.
Use this only when the system is frozen. On laptops you may need Fn with Alt and SysRq.