Comment 18 for bug 931929

Here same problem 3 years after releasing new version of Ubuntu. Today upgrading from 10.04 LTS to 12.04. Apart broken grub2 update, which I already worked around - system does not boot any more. System configuration: / at REVO Drive PCIe SSD, visible as fake raid (2x 115 GB) sdb & sdc, x86_64. Before upgrade in 10.04 it was recognised during boot as /dev/mapper/sil_biajabcecafc device, and root filesystem was mounted on it.
Unfortunately after update to 12.04 LTS , and fixing broken grub2 "grub_xputs" failure from pendrive my system is still unusable, probably due to invalid/broken initrd/udevd:
ALERT /dev/disk/by-uuid/3a11ac88-b86a-4500-a94a-737adf8b989e does not exist.
Dropping to a shell!
And your hints are not very helpful, because my new initrd upgraded by fresh ubuntu installation contains only dmsetup and mdadm binaries. I would add dmraid happily to initrd if my first boot was successful!

So problem #1 - how to create manually required device /dev/mapper/sil_biajabcecafc from initrd
Problem #2 - how to update broken installation 12.04 so it would have proper fakeraid autodetection in initrd
Problem #3 - how to inform people willing to install/update to 12.04 that they will have serious problems?