Public bug reported:

Greetings,

I recently upgraded from the 4.4.0-31 to 4.4.0-34 kernel in Ubuntu
16.04.  If I try booting from 4.4.0-34, my system freezes just after I
enter my password to decrypt my hard-drive.  If I ask it to boot from
4.4.0-31, everything is fine.

My boot.log file:

  lvmetad is not active yet, using direct activation during sysinit
  Volume group "ubuntu-vg" not found
  Cannot process volume group ubuntu-vg
  /run/lvm/lvmetad.socket: connect failed: No such file or directory
  WARNING: Failed to connect to lvmetad. Falling back to internal scanning.
  Reading all physical volumes.  This may take a while...
  Found volume group "ubuntu-vg" using metadata type lvm2
  /run/lvm/lvmetad.socket: connect failed: No such file or directory
  WARNING: Failed to connect to lvmetad. Falling back to internal scanning.
  2 logical volume(s) in volume group "ubuntu-vg" now active
/dev/mapper/ubuntu--vg-root: recovering journal
/dev/mapper/ubuntu--vg-root: clean, 525872/28426240 files, 91143613/113674240 
blocks


It's unclear to me what is going wrong.  There appears to be no activity on the 
computer.  I let the boot sequence sit for 10 minutes (way longer than an 
average boot time) my laptop's fan is running full-tilt.  But there was no 
hard-drive activity.  

How can I find out what's going wrong?

I'm running Ubuntu 16.04 Linux on a Lenovo W530.  I'm not certain what
other information would be helpful for a bug report.  I would be happy
to submit whatever is deemed helpful.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1611831

Title:
  Can't boot from new kernel 4.4.0-34.  Old kernel 4.4.0-31 is fine.

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