It looks to me that this is either a bug in unattended-upgrades, or
intended behaviour that due to the conffile prompt unattended-upgrades
is supposed to fail and requires user intervention to answer the prompt.
I'm not sure which.

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  package ntpdate 1:4.2.6.p5+dfsg-3ubuntu2.14.04.10 failed to
  install/upgrade: EOF on stdin at conffile prompt

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