Same issue [as in http://ubuntuforums.org/showthread.php?t=2198981] with Kubuntu 14.10 installed as a Virtualbox guest OS on an encrypted LVM disk. I get an "Enter passphrase:" label followed by a rectangular box, but no keyboard presses cause anything to be displayed (password stars, etc.). Pressing [Right-Ctrl]+[Del] reboots the VM and I get a text prompt for passphrase, which displays stars as I enter the passphrase, and allows me to continue booting. To me, seems to be an issue with the graphical UI which (I guess) is downgraded to text UI after rebooting detects it didn't succeed the first time.
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