send "root\r"
expect "# "
-send "apt update && apt-get -y -o Dpkg::Options::=--force-confnew dist-upgrade\r"
+send "apt update && DEBIAN_FRONTEND=noninteractive apt-get -y -o Dpkg::Options::=--force-confnew dist-upgrade\r"
expect "# "
send "apt-get --purge -y autoremove && apt-get clean\r"