Public bug reported:

I have DELL XPS 13 9343-2258 i7-5500U. with  ubuntu 15.04  and encrypted root 
filesystem.
A few days ago it received system upgrade which updated linux kernel to 
3.19.0-30-generic
Since then I cannot type password for decrypting root filesystem during boot.
Just after I turn on computer, usual graphical screen with "Enter passphrase" 
text and edit box appears but any character I type is not entered into edit box 
but shows up in the top-left corner of the screen. Pressing enter starts a new 
line of text in that corner.

I can workaround this problem by entering grub menu and choosing to boot
with configuration for previous kernel (3.19.0-28-generic). When started
this way, enter passphrase screen works correctly - typed characters
ends up inside edit box.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1501497

Title:
  Cannot enter passphrase during boot to decrypt root filesystem

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