Ubuntu9.04 dead end processing (Linux dead end processing)

1. X dead, (1) Ctrl-Alt-Backspace (ubuntu9.04 disabled by default, need to manually add) (2) Ctrl-Alt-(F1 ~ F6) 2. ubuntu9.04 is not stable and often completely dead. the above method is often useless. you can use the following method: At the same time press the left Alt key...

1. X dead,
(1) Ctrl-Alt-Backspace (ubuntu 9.04 disables this function by default and needs to be manually added)
(2) Ctrl-Alt-(F1 ~ F6)

2. ubuntu 9.04 is unstable and often completely dead. the above method is often useless. you can use the following method:
At the same time, press the left Alt key, SysRq key (on the same key as PrintScreen), and a keyboard key.
These keys need to work, as if to enable this function when compiling the kernel, which is available in the ubuntu 9.04 kernel.
(1) Alt-SysRq-R, and then Ctrl-Alt-Backspace. if not, take the following steps in sequence:
(2) Alt-SysRq-S save
(3) Alt-SysRq-E terminate all processes
(4) Alt-SysRq-I: killing unterminated processes
(5) Alt-SysRq-U umount
(6) Alt-SysRq-B reboot, and O is shutdown

It takes a certain period of time for the system to complete each operation. Therefore, we recommend that you separate the six buttons for about 10 seconds. The order of these six letters cannot be reversed. you can use busy -- busier -- (reverse) -- reisub to quickly remember the order.
 
3. if the problem persists, you may have to press the power key to shut down the instance.
Appendix:
Sys (tem) R (e) q (uest), full name: System Request (System Request)
How do I use the SysRq key? It is generally used in Linux.
Linux system, x86 CPU (including Intel x86 CPU), with "Alt-SysRq- <相应命令键> ", On some keyboards, the SysRq key is the Prt SC key (that is, the print screen key );
* Command description:
R: disable the raw mode of the keyboard and set it to XLATE.
K: SAK kills all processes in the current virtual middle-end.
B: restart immediately without refresh the disk or installing the file system.
O: shut down immediately.
S: refresh the disk cache.
U: re-mount all file systems as read-only
P: Display registers and flags on the console
T: print the current task and its information on the console
M: print memory information on the console
'0'-'9': Set the log level of the Kernel Console
E: send SIGTERM signals to all processes except init
I: send SIGKILL signals to all processes except init
L: send SIGKILL signals to all processes including init
H: displays help, that is, the command list.