Comment 14 for bug 595648

I found a solution in ubuntuusers Forum

http://forum.ubuntuusers.de/topic/script-verschluesseltes-system-via-ssh-freisch/#post-2797575

this guy wrote a little script. It worked for me (10.10)now I'm able to unlock locally AND over ssh

just copy this script into /usr/share/initramfs-tools/hooks/
make it executable
(chmod +x) and
update-initramfs -u

reboot.... now ure up and running