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[gravy45 <1359689@xxxxxxxxxxxxxxxxxx>]

Those of you on 15.04 (and possibly earlier), can try to adjust /etc/default/grub to:
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
# GRUB_GFXPAYLOAD_LINUX=text

Then at the terminal:
sudo update-grub
..and reboot...

If it works you will get a simple text-based entry of the passphrase.

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https://bugs.launchpad.net/bugs/1359689

Title:
  cryptsetup password prompt not shown

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Utopic:
  Triaged
Status in linux source package in Vivid:
  Triaged

Bug description:
  Currently in utopic the following happens when booting an encrypted
  setup:

  Press enter in grub, after a while screen freezes (or turns completely
  black) and stays like that. When I press the down key, I can see the
  password prompt. When I press the up key again, I get to the graphical
  password prompt.

  This is demonstrated in the following screencast:
  https://drive.google.com/file/d/0B7EMvd1LJKgZREJocHBueEhpa2s/edit?usp=sharing

  Maybe this is related to the version of plymouth utopic currently uses, a similar debian bug report seems to be resolved with a newer version 0.9.0-6, see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=752752.
  --- 
  ApportVersion: 2.14.6-0ubuntu2
  Architecture: amd64
  DistroRelease: Ubuntu 14.10
  InstallationDate: Installed on 2014-08-21 (0 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140821)
  Package: plymouth 0.9.0-0ubuntu3
  PackageArchitecture: amd64
  ProcVersionSignature: Ubuntu 3.16.0-9.14-generic 3.16.1
  Tags:  utopic
  Uname: Linux 3.16.0-9-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  --- 
  ApportVersion: 2.14.6-0ubuntu2
  Architecture: amd64
  DefaultPlymouth: /lib/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth
  DistroRelease: Ubuntu 14.10
  InstallationDate: Installed on 2014-08-21 (0 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140821)
  MachineType: Dell Inc. Precision M4600
  Package: plymouth 0.9.0-0ubuntu3
  PackageArchitecture: amd64
  ProcCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-9-generic root=/dev/mapper/VG--Ubuntu-LV--Ubuntu--ROOT ro rootflags=subvol=@ cryptopts=target=Ubuntu,source=/dev/disk/by-uuid/6fc200da-aa04-4e73-b6a7-a2326f0b6204,lvm=VG-Ubuntu quiet splash vt.handoff=7
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-9-generic root=/dev/mapper/VG--Ubuntu-LV--Ubuntu--ROOT ro rootflags=subvol=@ cryptopts=target=Ubuntu,source=/dev/disk/by-uuid/6fc200da-aa04-4e73-b6a7-a2326f0b6204,lvm=VG-Ubuntu quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.16.0-9.14-generic 3.16.1
  Tags:  utopic
  TextPlymouth: /lib/plymouth/themes/ubuntu-text/ubuntu-text.plymouth
  Uname: Linux 3.16.0-9-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 03/10/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A14
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA14:bd03/10/2013:svnDellInc.:pnPrecisionM4600:pvr01:rvnDellInc.:rn:rvr:cvnDellInc.:ct9:cvr:
  dmi.product.name: Precision M4600
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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