A better workaround (than hitting ctrl+alt+(F1-F7) keys and then Escape)
is to remove the boot options 'splash $vt_handoff'

You can do it 'live' after pressing the left shift key during boot and
then the 'e' key.

-o-

You can actually enter the passphase while the dark blue screen (in
Lubuntu) is displayed (without any help text and without feedback stars
or dots). But it is confusing and would make most users think that the
boot has failed. I did not think of it until I had a nights sleep ;-)

** Description changed:

  Iso-testing Lubuntu Alternate i386 iso file, testcase 'Alternate Install
  (Encryption) in Lubuntu Alternate i386 in Xenial Xerus Daily (alias
  Alpha1 in this case)
  
  The bug appears in the installed system:
  
  The passphrase input-box for encrypted disk is not shown (and the
  plymouth dots are not shown either, only a dark blue background).
  Pressing some of the
  
  ctrl + alt + (F1-F7) keys
  
  and after that
  
  Escape
  
  brings a text screen with the text 'Please unlock disk sda5_crypt', and
  it is possible to enter the passphrase, and I arrive at the login
  screen.
  
  (Otherwise the encrypted disk and also encrypted home work.)
+ 
+ *****
+ A better workaround (than hitting ctrl+alt+(F1-F7) keys and then Escape)
+ is to remove the boot options 'splash $vt_handoff'
+ 
+ You can do it 'live' after pressing the left shift key during boot and
+ then the 'e' key.
+ 
+ -o-
+ 
+ You can actually enter the passphase while the dark blue screen (in Lubuntu) 
is displayed (without any help text and without feedback stars or dots). But it 
is confusing and would make most users think that the boot has failed. I did 
not think of it until I had a nights sleep ;-)
+ *****
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: plymouth 0.9.2-3ubuntu8
  ProcVersionSignature: Ubuntu 4.3.0-2.11-generic 4.3.0
  Uname: Linux 4.3.0-2-generic i686
  ApportVersion: 2.19.3-0ubuntu2
  Architecture: i386
  CurrentDesktop: LXDE
  Date: Sat Jan  2 15:50:33 2016
  DefaultPlymouth: /usr/share/plymouth/themes/lubuntu-logo/lubuntu-logo.plymouth
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2016-01-02 (0 days ago)
  InstallationMedia: Lubuntu 16.04 LTS "Xenial Xerus" - Alpha i386 (20160102)
  MachineType: TOSHIBA SATELLITE PRO C850-19W
  ProcCmdLine: BOOT_IMAGE=/vmlinuz-4.3.0-2-generic 
root=/dev/mapper/hostname--vg-root ro quiet splash vt.handoff=7
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.3.0-2-generic 
root=/dev/mapper/hostname--vg-root ro quiet splash vt.handoff=7
  SourcePackage: plymouth
  TextPlymouth: /usr/share/plymouth/themes/lubuntu-text/lubuntu-text.plymouth
  UdevLog: Error: [Errno 2] Filen eller katalogen finns inte: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/24/2012
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: 6.10
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: PLCSF8
  dmi.board.vendor: Intel
  dmi.board.version: Type2 - Board Version
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: OEM Chassis Manufacturer
  dmi.chassis.version: OEM Chassis Version
  dmi.modalias: 
dmi:bvnInsydeCorp.:bvr6.10:bd09/24/2012:svnTOSHIBA:pnSATELLITEPROC850-19W:pvrPSCBXE-00C00VN5:rvnIntel:rnPLCSF8:rvrType2-BoardVersion:cvnOEMChassisManufacturer:ct10:cvrOEMChassisVersion:
  dmi.product.name: SATELLITE PRO C850-19W
  dmi.product.version: PSCBXE-00C00VN5
  dmi.sys.vendor: TOSHIBA

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https://bugs.launchpad.net/bugs/1530548

Title:
  passphrase input-box for encrypted disk is not shown

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