/dev/random blocks until it has enough entropy to guarantee
randomness.  That is probably why wiggling the touchpad gets things
going again.

If you have /dev/hwrandom, you can use that...  Otherwise, you can use
/dev/urandom to avoid blocking, but theoretically this could give up
some security (since the random generator's internal state could be
predictable at boot).

-- 
Upstart doesn't activate luks volumes (also non luks) in cryptsetup
https://bugs.launchpad.net/bugs/62751
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