[Bug 1481536] Re: "cryptsetup: unknown fstype, bad password or options?" error unlocking / decrypting LUKS volume at boot

[Richard Hansen]

Attached is a new revision (v4) of the patch, this time targeted to
Xenial (16.04) instead of Wily (15.10).

Changes from v3 to v4:

  * restore activate_vg() (which runs 'lvm vgscan' and 'llvm vgchange
    -a y') because Xenial's lvm2 package no longer includes udev rules
    that run those commands (as of 2.02.133-1ubuntu8)
  * improvements to log messages
  * drop to a shell if cryptsetup successfully unlocks the device but
    the unlocked device doesn't appear
  * drop to a shell if an LVM logical volume is expected but doesn't
    appear

A patched package has been uploaded to my PPA:
https://launchpad.net/~rhansen/+archive/ubuntu/bug1481536


** Patch added: "cryptsetup-1481536-v4.patch"
   https://bugs.launchpad.net/ubuntu/+source/cryptsetup/+bug/1481536/+attachment/4649908/+files/cryptsetup-1481536-v4.patch

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Title:
  "cryptsetup: unknown fstype, bad password or options?" error unlocking
  / decrypting LUKS volume at boot

Status in cryptsetup:
  Confirmed
Status in One Hundred Papercuts:
  Confirmed
Status in cryptsetup package in Ubuntu:
  Confirmed

Bug description:
  Since upgrading to cryptsetup-1.6.6-5ubuntu1 to replace
  cryptsetup-1.6.1-1ubuntu7 today on my Ubuntu Wily 15.10 installation,
  I have been receiving an error message at boot time after entering my
  passphrase to unlock the LUKS partition.

  I noticed that at the same time the verbiage of the prompt to enter
  the passphrase also changed, to something like "Please unlock
  <devicename>", which is a little different than before, so I'm
  guessing something in this change may have caused the error message.

  Interestingly, the error message does not impede successful system
  boot, so my suspicion is that the error is maybe not real, but just
  being incorrectly displayed.  In other words, if I successfully enter
  the passphrase, this error will appear but the system will then
  proceed to boot successfully and have the encrypted volume
  successfully mounted.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: cryptsetup 2:1.6.6-5ubuntu1
  ProcVersionSignature: Ubuntu 4.1.0-3.3-generic 4.1.3
  Uname: Linux 4.1.0-3-generic x86_64
  ApportVersion: 2.18-0ubuntu5
  Architecture: amd64
  Date: Tue Aug  4 20:46:55 2015
  InstallationDate: Installed on 2015-05-28 (68 days ago)
  InstallationMedia: Xubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422.1)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: cryptsetup
  UpgradeStatus: No upgrade log present (probably fresh install)
  crypttab: sda3_crypt UUID=fe4c1c1f-252e-4bcc-904c-07896f9b1361 none luks,discard

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