sudo dpkg-reconfigure dash #####choose NO

sudo apt update
sudo apt -y install libtool-bin \
  python2 gcc make perl tofrodos iproute2 gawk git \
  xvfb net-tools tftp-hpa tftpd-hpa flex bison \
  screen pax gzip tar gnupg wget diffstat chrpath \
  socat xterm autoconf libtool tar unzip texinfo \
  gcc-multilib build-essential libselinux1 \
  zlib1g-dev zlib1g-dev:i386 \
  libsdl1.2-dev libglib2.0-dev \
  libssl-dev libncurses5-dev libncursesw5 \
  nfs-kernel-server openssh-server \
  expect

sudo mkdir -p /tftpboot
sudo chown rf:rf /tftpboot
chmod 777 /tftpboot

sudo cp -f /etc/default/tftpd-hpa /etc/default/tftpd-hpa.bak

sudo tee /etc/default/tftpd-hpa << EOF
# /etc/default/tftpd-hpa

TFTP_USERNAME="tftp"
TFTP_DIRECTORY="/tftpboot"
TFTP_ADDRESS=":69"
TFTP_OPTIONS="-l -c -s"
EOF

sudo service tftpd-hpa restart

sudo apt-get install openssh-server
# vim /etc/ssh/sshd_config