Public bug reported:

Ubuntu was installed on my computer and worked fine until yesterday
(version 8.04, up-to-date every day). yesterday it reported errors after
boot screen with Ubuntu logo instead of switching to GUI mode. screen
output looks like this:

[unix-formatted time] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 
frozen
[unix-formatted time] ata1.00: cmd a0/01:00:00:60:00/00:00:00:00:00/a0 tag 0 
dma 96 in
[unix-formatted time] ata1.00: status: { DRDY }

it repeats about 6-8 times and than hangs. i took off hard drive and
tried to boot from LiveCD (versions from 6.xx to 8.04, same results).
screen output stays the same, except that it starts with this lines:

BusyBox v1.1.3 (Debian 1:1.1.3-5ubuntu12) Built-in shell (ash)
Enter 'help' for list of build-in commands.
(initramfs)

and just before system hangs there is one more line:

[unix-formatted time] ata1.00: revalidation failed (errno=-5)

memory test on LiveCD works and reports no errors. to check hardware
state i installed windows system and it's hardware tests reported no
errors too.

** Affects: ubuntu
     Importance: Undecided
         Status: New

-- 
LiveCD reports a hardware error
https://bugs.launchpad.net/bugs/267128
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