I don't know if this is considered recovery mode but going this route allowed 
me to workaround it (am running Ubuntu MATE 15.04 Beta 2 in a Virtualbox 
guest), but of course no longer have a graphical boot..:
http://ubuntuforums.org/showthread.php?t=2251116&p=13158092#post13158092

Martin Wimpress lists what I did as a solution to Virtualbox Guests showing up 
as 640x480 resolution.
https://ubuntu-mate.org/blog/ubuntu-mate-vivid-beta2/#disqus_thread

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https://bugs.launchpad.net/bugs/1386005

Title:
  Password not accepted graphical boot for encrypted root system

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