Public bug reported:

When you install a new Natty Xen DomU with xen-create-image or upgrade
Maverick to Natty, the system cannot boot because the xen-blkfront
module is missing from the initramfs. Therefore, the root disk device
can't be found.

When that happens and the system gives a failsafe initramfs prompt when
booting, do this:

modprobe xen-blkfront
exit

Then it boots.

To make it permanent:

root@ubuntu:~# echo "xen-blkfront" >> /etc/initramfs-tools/modules
root@ubuntu:~# update-initramfs -u

I tested it and it works.

I also have several 10.04 Ubuntu's as DomU which also don't have xen-
blkfront in the initramfs, but it works fine (/dev/xvda can be found
properly). I don't know what changed.

I also don't know which package this affects.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/839492

Title:
  xen-blkfront module missing from initramfs, Ubuntu as DomU can't boot

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