+ # This block performs completely non-interactive updates {{
+ export DEBIAN_FRONTEND=noninteractive
+ export DEBCONF_NONINTERACTIVE_SEEN=true
+ echo "grub-pc hold" | dpkg --set-selections
+ apt-get -y update
+ apt-get -y --allow-unauthenticated upgrade \
+ -o Dpkg::Options::="--force-confdef" \
+ -o Dpkg::Options::="--force-confold"
+ # }}