This really sounds like some problem related to the construction of the initrd.
But it would be good to have some more information. One problem is that it is
that I cannot really see how the exact setup is. I would suspect sda contains
/boot (the partition table looks suspicious there, too), sd[bcd] probably make
up the RAID?
First thing to try is to boot the new kernel but from the grub menu remove
"quiet slpash" and replace it with "debug". Then when dropping into busybox
check wether the dmraid-45 module is loaded, whether there is a dmraid-activate
and whether it maybe is possible to manually progress by calling that and then
vgchange -ay and should that bring up the root vg, exit the busybox shell.
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Stefan Bader (stefan-bader-canonical)
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https://bugs.launchpad.net/bugs/948291
Title:
New 12.04 beta Kernel doesn't support booting from dmraid
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