grub password setting about ubuntu 16.04

[liuxinpeng]

hello there,
i want make a preseed file about ubuntu 16.04. 
But i find some settings as following cannot work.
d-i grub-installer/password password r00tme
d-i grub-installer/password-again password r00tme


could you give me some advise?

Daniel,
Thanks in advanced.
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