$ sudo -s
# sed -i "$ a\\ipv6.disable=1" /boot/armbianEnv.txt
# echo "blacklist ipv6 > /etc/modprobe.d/no-ipv6.conf
# echo "net.ipv6.conf.all.disable_ipv6 = 1" > /etc/sysctl.d/no-ipv6.conf
# sed -i "/::/s/^/# /" /etc/hosts
# reboot