export DISTRO_NAME=${DISTRO_NAME:-ubuntu}
export DIB_RELEASE=${DIB_RELEASE:-xenial}
export DIB_DEBIAN_COMPONENTS=${DIB_DEBIAN_COMPONENTS:-main,universe}

# There are two default distro mirrors depending on architecture
ARCH=${ARCH:-}
if [[ "arm64 armhf powerpc ppc64el s390x" =~ "$ARCH" ]]; then
    default_ubuntu_mirror=http://ports.ubuntu.com/ubuntu-ports
else
    default_ubuntu_mirror=http://archive.ubuntu.com/ubuntu
fi

export DIB_DISTRIBUTION_MIRROR=${DIB_DISTRIBUTION_MIRROR:-$default_ubuntu_mirror}

export DISTRO_NAME=${DISTRO_NAME:-ubuntu}
export DIB_RELEASE=${DIB_RELEASE:-bionic}
export DIB_DEBIAN_COMPONENTS=${DIB_DEBIAN_COMPONENTS:-main,universe}

# There are two default distro mirrors depending on architecture
ARCH=${ARCH:-}
if [[ "arm64 armhf powerpc ppc64el s390x" =~ "$ARCH" ]]; then
    default_ubuntu_mirror=http://ports.ubuntu.com/ubuntu-ports
else
    default_ubuntu_mirror=http://archive.ubuntu.com/ubuntu
fi

export DIB_DISTRIBUTION_MIRROR=${DIB_DISTRIBUTION_MIRROR:-$default_ubuntu_mirror}

Update default DIB_RELEASE to bionic
ubuntu-common: Update default DIB_RELEASE to bionic

The ubuntu-minimal README states that the latest Ubuntu LTS
is the default, but currently that is not true. This patch
changes the default to the current LTS.

Change-Id: I10f28314d1a5969c20094194637cfe31219d228c
