I can confirm this bug as I've seen the same behavior.  After a fresh
boot, when I log in my CPU is running at 100% and the culprit is
sreadahead.  sreadahead then exits after a minute or so.  If you want,
you can disable sreadahead by editing the file at
/etc/init/sreadahead.conf and commenting out the line that reads:

exec /sbin/sreadahead -t 0

I did this on my Thinkpad R61 (with a spinning hard drive) and my boot
time dropped from 61 seconds to 49 seconds.

-- 
sreadahead uses 100 % of the CPU in Karmic
https://bugs.launchpad.net/bugs/421116
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