When your Linux install completely refuses to respond and no amount of coaxing and cajoling brings it back to life you can try -
This will kill all running programmes and will drop you back to the login screen.
- Alt + SysRq + k
Even this fails? The try this -
This is easy to remember with the help of the mnemonic "Raising Elephants Is So Ultra Boring".
- Alt + SysRq + r + e + i + s + u + b
But for this to work two things are required
- Alt + SysRq + r = raw keyboard mode
- Alt + SysRq + e = ends all programmes
- Alt + SysRq + i = kills all programmes that did not terminate nicely
- Alt + SysRq + s = syncs the disks
- Alt + SysRq + u = remounts all filesystems as read-only
- Alt + SysRq + b = reboots
- Your kernel must support magic keys
- The following line must be appended to /etc/sysctl.conf
So when your Linux box simply refuses to respond (yes, even a Linux box does sometimes act up), you can safely tide over the situation if you follow these instructions.