Comment 18 for bug 123789

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)