Public bug reported:

The symptoms for this bug are very similar to those of #1396213: booting
(a freshly installed wily VM) drops me to the (initramfs) prompt because
the root filesystem (root=/dev/mapper/VG-root) cannot be found. Typing
"vgchange -a y; exit" at the (initramfs) prompt allows the boot to
continue normally.

The reason I'm filing a separate bug is that the discussion of #1396213
blames the problem on LVM snapshots and my setup does not have a
snapshot: it happens on a system freshly installed using d-i, on the
first reboot after installation (and on all subsequent reboots so far).
As a result, I am not sure the root cause is the same.

I've tried rootdelay=120 but that did not help.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: lvm2 2.02.111-2ubuntu1
ProcVersionSignature: Ubuntu 3.19.0-22.22-generic 3.19.8-ckt1
Uname: Linux 3.19.0-22-generic i686
ApportVersion: 2.17.3-0ubuntu4
Architecture: i386
Date: Sat Jun 20 19:53:02 2015
SourcePackage: lvm2
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: lvm2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 wily

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https://bugs.launchpad.net/bugs/1467153

Title:
  LVM VG not activated at boot, no snapshots used

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