Happily, true system "lockups" or "crashes" are pretty rare with Kubuntu Linux, but apparent lockups in which the screen goes black and the mouse and keyboard stop responding can happen - that is actually a crash of the X server (K Display Manager or KDM) only, or possible some other process has run amok and is consuming 100% of the CPU resource. If, immediately preceding the lockup you did NOT see a "kernel panic" message, then it is probably not a system crash, and you (and your filesystem) will have a brighter future if you will execute a graceful shutdown and reboot. Here is what to do.
First, the mnemonic to remember:
Raising Skinny Elephants Is Utterly Boring
BEFORE you reach for that power switch, give the Alt-SysRq combo a chance to do a graceful shutdown/reboot. Press and hold down "Alt-SysRq" ("SysRq" is the key otherwise known in DOS-world as "PrtScn", normally near the right end of the top row of keys) and then, one at a time, S-L-O-W-L-Y in sequence, " r s e i u b ".
Probably you will be amazed to see your "locked up" system do a shutdown and normal reboot.
Reference: http://linuxgazette.net/issue81/vikas.html
First, the mnemonic to remember:
Raising Skinny Elephants Is Utterly Boring
BEFORE you reach for that power switch, give the Alt-SysRq combo a chance to do a graceful shutdown/reboot. Press and hold down "Alt-SysRq" ("SysRq" is the key otherwise known in DOS-world as "PrtScn", normally near the right end of the top row of keys) and then, one at a time, S-L-O-W-L-Y in sequence, " r s e i u b ".
Probably you will be amazed to see your "locked up" system do a shutdown and normal reboot.
Reference: http://linuxgazette.net/issue81/vikas.html
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