Same problem here.

Booting my pc, I end up in a "(initramfs)" shell; and when I tried to
mount a filesystem manually, I got

(initramfs) mount /dev/sda6 /root
mount: Mounting /dev/sda6 on /root failed: Device or resource busy

Searching in google, I found a thread which suggest that is dmmapper who
locks the device. In fact doing

(initramfs) dmsetup remove_all

I was able to mount /dev/sda6. 
Note : no,  /dev/sda6  *is not* a evms/lvm/dm partition, but an ext3 play 
partition. And yes I have some lvm volume.

After a search under /usr/share/initramfs-tools, I found that evms is
called during the boot. So I removed the evms package (I don't know if
it is used at all) and now I am able to boot the machine.

My ubuntu is not a fresh installation, but an update from an old one.
That can explain because I had evms (I don't know if it is installed as
default)

-- 
Kernel 2.6.22-x will not boot on laptop
https://bugs.launchpad.net/bugs/123789
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