Public bug reported:

After recently update kernel to 3.0.0-19.33 I cannot start the system.
After selecting new kernel in grub menu it shows only "error: couldn't
read file"

I removed quiet and splash from booting options and it outputed a lot of data 
and hanged. What was intereseting there is
"Cannot open root device UUID=[here was uuid] or unknown block (0,0)"

and below
Please append a corrct "root=" boot option

I tried and added this option to the line
linux   /boot/vmlinuz-3.0.0-19-generic 
root=UUID=8873b057-f710-4b9e-9ebe-ce9b0e586cd2 ro   quiet splash vt.handoff=7 
root=/dev/sda5

but with no luck.
I run knoppix live cd and fsck all partinions but no problems were found.
I found similar problems on few forums
Here: 
http://www.linuxforums.org/forum/gentoo-linux/94418-error-vfs-cannot-open-root-device-unknown-block-0-0-a-3.html
and here: http://forums.funtoo.org/viewtopic.php?id=273

The solution there was missing SATA_AHCI support. I looked into my
/boot/config-3.0.0-19-generic but sata suppor was enable there. Actually
kernel config differs from the 3.0.0-17 only in name and signature, the
rest is identicall.

I run Dell Studio 15555 and I am able to run without errors on my
previous kernel 3.0.0-17

System: Kubuntu 11.10 64bit

** Affects: linux-lts-backport-oneiric (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/993870

Title:
  System fails to boot after kernel upgrade to 3.0.0-19.33

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