Public bug reported:

edgy
boot sequence is stopped even in rescue mode.
when loading manual drivers it reports

BUG: soft lock detected on CPU#0

The system is then stuck and no longer responds. This bug is terrible
because the machine cannot be accessed even in single mode.

How the problem began: The computer was updated from dapper to edgy. It worked 
reasonably well although the power manager did not perform the expected 
operations, in particular for lid closed (dell inspiron 6400, duo core). System 
went to sleep but did not wake up again. A hard reset allowed to restart the 
system.
Then loaded kpowersave battery monitor. Closed lid and system did not wake. But 
upon hard switch reboot could no longer boot as mentioned at the beginning.

** Affects: Ubuntu
     Importance: Undecided
         Status: Unconfirmed

-- 
system locked up on boot!
https://launchpad.net/bugs/69086

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