This sequence of commands works for me:

export DEBIAN_FRONTEND=noninteractive
apt-get update
apt-get upgrade -yq

So, DEBIAN_FRONTEND=noninteractive is correct but you also need the -q flag.

Source: https://github.com/moby/moby/issues/4032

This sequence of commands works for me:

apt-get update
DEBIAN_FRONTEND=noninteractive apt-get upgrade -yq

So, DEBIAN_FRONTEND=noninteractive is correct but you also need the -q flag.

Source: https://github.com/moby/moby/issues/4032