[Bug 1421877] [NEW] boot fails with lvm root device in /dev/mapper not found after updates from proposed

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System:  Ubuntu 14.04 64 bits
I have run a packages update/upgrade with synaptic. (Note that I had proposed-update repo enabled).
Among other things a new kernel was installed and libc-bin was updated both likely from proposed-update since I didn't see them in my other box which doesn't use this source  (see attached dpkg.log for full list of recently installed packages. The culprit is probably at the end of that list).

After the upgrade, I rebooted the system.

I got the initramfs prompt with an error message saying that it gave up waiting for root devive /dev/mapper/sysvg-lvroot1
I could not find the mapper entry under /dev but I could find /dev/sysvg/lvroot1 and mount it alright from the busybox prompt.

Tried booting with 2 previous kernels to no avail: same problem with
root device even though previous kernels worked fine.

I booted from live usb, chrooted my ubuntu, merged my 10 days old sysvg-
lvroot1 lvm snapshot, deleted last kernel from /boot (from last update)
and forced reinstalled previous kernel. Then I could boot alright and I
have disabled proposed-update.

The problem was with all kernels, hence the culprit is likely grub.cfg
which is updated at each kernel update.  Between my previous snapshots
and today failed boot something must have changed on my system which has
resulted in the grub-mkconfig (or whatever tool is called to write
grub.cfg when kernel is updated) producing a wrong config.

Here is a filtered (I have removed what I think is irrelevant, the full
list is in attachment) list of the packages last installed:

bsdutils libblkid1 libc-bin libmount1 libuuid1 linux-generic linux-
headers-3.13.0-46 linux-headers-3.13.0-46-generic linux-headers-generic
linux-image-3.13.0-46-generic linux-image-extra-3.13.0-46-generic linux-
image-generic linux-libc-dev mount ureadahead util-linux uuid-runtime

I would say that blkid, uuid and mount are suspicious.

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New

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boot fails with lvm root device in /dev/mapper not found after updates from proposed
https://bugs.launchpad.net/bugs/1421877
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