How to Reboot Your Ubuntu System only if all else fails
Posted by admin on December 27th, 2006 
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There’s two more options that you may not have known about
Here are two ways to first try and kill just the process on your current terminal and if that fails, to bring your machine down in a more graceful manner than a hard shutdown.
First, we’ll try and kill all the process on your current terminal. To do this, hold down the following keys -
ALT + SysReq + k
SysReq key means you need to Look for it on your PrtSc or Print Screen key. The k in this instance stands for Kill.
You’ll now enter a series of keystrokes that will tell your computer to do some housekeeping before shutting down.
ALT + SysReq + r
This stands for Raw keyboard mode.
ALT + SysReq + s
This syncs the disk.
ALT + SysReq + e
This terminates all processes
ALT + SysReq + i
Kill’s all processes that weren’t terminated nicely.
ALT + SysReq + u
Remounts all filesystems as read only.
ALT + SysReq + b
February 24th, 2008 at 7:36 am
actually, i think it should be
alt+sysrq
then
r
e
i
s
u
b
this makes it easier to remember as it spells “busier” backwards, or you can then use the mnemonic of “Raising Elephants Is So Utterly Boring”
though this works fine too, i suppose…check wikipedia’s entry on “magic sysrq” for more…