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

[Johnny Rogers]

I've gotten this message as well for Kubuntu Wily, but I didn't have
issues unlocking it. I first get the prompt screen for  cryptsetup to
enter password, I then enter correct password for it, I then get:
"Unknown Fstype, bad password or options?" Then it gives message
"sda5_crypt setup successfully", and then loads up the user /password
prompt screen before entering into desktop / Kubuntu Wily. Not sure why
I would get "Unknown fstype, bad password or options?" message, when I
entered correct password from get go lol.

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

Status in cryptsetup package in Ubuntu:
  New

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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