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Upgrade Ubuntu to latest LTS (Bionic 18.04), including: - Change the IMAGE used for base-notebook; - Keep Mesos install from Mesosphere's Xenial repository, since they don't yet have a Bionic repository; - gnupg needs to be installed for apt-key to work; - --force-yes option to apt-get has been removed; - Package libav-tools is replaced by ffmpeg; - Update Let's Encrypt example script to use 18.04.