Upgrade to Ubuntu 18.04 bionic#193

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ishitatsuyuki wants to merge 3 commits intomasterfrom

Commits on Jan 4, 2019

Upgrade to Ubuntu 18.04 bionic

ishitatsuyuki
authored and
jankeromnes
committed
Add gpg-agent

ishitatsuyuki
authored and
jankeromnes
committed
Disable interactive configuration

ishitatsuyuki
authored and
jankeromnes
committed