Yeah, I was in hurry and didn't have the time to give you the reason why
I did this.

I sent the latest apport from a kernel with which I don't experience the
issue. The difference is that I see these messages:

[    5.527952] bio: create slab <bio-1> at 1
[  151.415509] bio: create slab <bio-2> at 2
[  161.717873] bio: create slab <bio-3> at 3
[  162.277013] bio: create slab <bio-4> at 4

When the last of these appears, boot immediately continues correctly.
Not sure if it's of any relevance.

Anyway, today I've tried the following mainline kernels:
3.13.0-031300
3.14.0-031400
3.15.0-031500
3.16.0-031600

What surprised me is that even with 3.13.0-031300 I experienced the
problem. I'm kind of confused now. I'll continue investigation tomorrow.
I will do kernel bisection as you requested, but first I'd like to make
sure the problem is not with initrd-s. I don't know what to do if it
turns out my initrd-s are the culprits. The only working kernel I have
(vmlinuz-3.13.0-37-generic) has its initrd generated from the old Trusty
times. It seems every initrd I generate with any new installed kernel
with Utopic, has the problem.

I won't send more apports, sorry for the inconvenience.

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https://bugs.launchpad.net/bugs/1396213

Title:
  LVM VG is not activated during system boot

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