I think it's very likely this is (at least in some cases) related to
nvidia drivers.

I first got this problem while trying to fix a problem with ubuntu
freezing after initial login described
[here](http://askubuntu.com/a/760935/207604). I did "update" > "upgrade"
> "upgrade nvidia drivers" as per the answer I've highlighted.

Unfortunately this upgraded the kernel from .36 to .38 as well as
upgrading nvidia drivers from 364 (I think) to 370, so I don't know
which caused the problem.

For anyone else with this problem: the only solution/work-around I found
was to set

    GRUB_CMDLINE_LINUX=""
    GRUB_CMDLINE_LINUX_DEFAULT=""

in "/etc/default/grub", then "update-grub". Not sure if both are
required but that worked and I'm not touching it any more.

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https://bugs.launchpad.net/bugs/1359689

Title:
  cryptsetup password prompt not shown

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