@Andy - I do not get dropped into buysbox.  I end up sitting at a
purpleish screen saying "Ubuntu" with the 4-dots cycling left to right
and a white font saying, “cryptsetup: evms_activate is not available".
In other words, it looks very much like a proper decrypt-prompt, but
with the wrong text.

Alt-F1 does drop me into busybox.  I am also able to drop myself into
busybox during the boot with the working kernel.  Comparing the two:

In the non-working case, there are no "disks/by-label" or "disks/by-
uuid" directories.  The "disks/by-path" directory is missing three of
what should be seven entries:

pci-0000:02:06.0-sas-0x500e81000011bd5-lun-0
pci-0000:02:06.0-sas-0x500e81000011bd5-lun-0-part1
pci-0000:02:06.0-sas-0x500e81000011bd5-lun-0-part2

The "disks/by-id" directory is missing all the "md-name" and "md-uuid"
entries and is missing half of the "ata-" "scsi-" and "wwn-" entries.

I am guessing that I am missing one of my disks on the non-working
kernel.  The system has two Western Digital 1TB disks (in a RAID), each
on a different controller.  One is on the main controller on the board,
and the other is on a PCI-X based (SATA/SAS) controller.  I am looking
at what is missing under "disks/by-path" and, because of the "sas"
there, wondering if that second controller is for some reason not being
seen with the new kernel?

Can you help me with next steps?

Thanks/

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https://bugs.launchpad.net/bugs/1336659

Title:
  Boot fails after installing updates, error: “cryptsetup: evms_activate
  is not available"

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