Bootstrap: docker From: ubuntu:20.04 %post export DEBIAN_FRONTEND=noninteractive apt-get update && apt-get install -y \ build-essential \ firefox \ tzdata \ locales \ libpci-dev \ libegl1-mesa \ libgl1-mesa-glx \ dbus-x11 \ procps \ coreutils ln -fs /usr/share/zoneinfo/Europe/London /etc/localtime dpkg-reconfigure --frontend noninteractive tzdata locale-gen en_GB.UTF-8 update-locale LANG=en_GB.UTF-8 mkdir -p /mnt/tmp %environment export TZ=Europe/London export LANG=en_GB.UTF-8 export LC_ALL=en_GB.UTF-8 export TMPDIR=/mnt/tmp %runscript exec /usr/bin/firefox "$@"