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[tongr <toni.gruetze+ubuntuone@xxxxxxxxx>]

I have the same Problem and I found a similar Bug #1044251 (https://bugs.launchpad.net/bugs/1044251) solved in 2012
For me, enabling the 'Manual Login'' and replacing unity works so far.
This is just an (ugly) workaround (Loginpromt changes), but some parts of the old fix might be applied here as well?

I applied the following steps:
1. Switch to tty1 ( [Ctrl]+[Alt]+[F1] ) and login
2. edit the appropriate lightdm configuration, in my case:
    sudo vim /usr/share/lightdm/lightdm.conf.d/50-unity-greeter.conf
3. set/add th following property
    greeter-show-manual-login=true

To be able to continue work w/o restarting lightdm (loosing all running
processes / open windows), one can simply replace unity  (see also
accepted answer in http://superuser.com/questions/570194/how-
do-i-restart-a-frozen-screen-in-ubuntu-without-losing-any-open-windows )

4. set and export the DISPLAY variable:
    DISPLAY=:0
    export DISPLAY
5. run (re-)unity (--replace might not be neccessary):
    unity --replace

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https://bugs.launchpad.net/bugs/1311316

Title:
  After locking screen there is no input field to type password for
  unlock

Status in Unity:
  Triaged
Status in “unity” package in Ubuntu:
  Confirmed

Bug description:
  Sometimes (but not always) after locking the screen there is the
  situation not having any input field where I can type the password to
  unlock the session again. The shaded gray area simply does not have
  the input field. I can't do anything, I have to switch to text console
  and stop/start lightdm service to cure the problem loosing all of my
  session :(

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity 7.2.0+14.04.20140416-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic i686
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: i386
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CurrentDesktop: Unity
  Date: Tue Apr 22 22:17:57 2014
  InstallationDate: Installed on 2012-03-03 (780 days ago)
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
  SourcePackage: unity
  UpgradeStatus: Upgraded to trusty on 2013-10-18 (186 days ago)

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