When trying to provision a do 15.04 8GB droplet in lon1 with packer 0.8.6

gistfile1.txt

    digitalocean: Setting up grub2-common (2.02~beta2-22ubuntu1.1) ...
    digitalocean: Setting up grub-pc-bin (2.02~beta2-22ubuntu1.1) ...
    digitalocean: Setting up grub-pc (2.02~beta2-22ubuntu1.1) ...
    digitalocean: debconf: unable to initialize frontend: Dialog
    digitalocean: debconf: (Dialog frontend will not work on a dumb terminal, an emacs shell buffer, or without a controlling terminal.)
    digitalocean: debconf: falling back to frontend: Readline
    digitalocean: Configuring grub-pc
    digitalocean: -------------------
    digitalocean:
    digitalocean: A new version (/tmp/grub.8plbjIAjq1) of configuration file /etc/default/grub is
    digitalocean: available, but the version installed currently has been locally modified.
    digitalocean:
    digitalocean: 1. install the package maintainer's version
    digitalocean: 2. keep the local version currently installed
    digitalocean: 3. show the differences between the versions
    digitalocean: 4. show a side-by-side difference between the versions
    digitalocean: 5. show a 3-way difference between available versions
    digitalocean: 6. do a 3-way merge between available versions (experimental)
    digitalocean: 7. start a new shell to examine the situation
    digitalocean: