Minimal Debian Image

setup.sh

# Install cleanup utils
apt-get install -y deborphan

# Remove all desktop/gui/hci packages/libraries
apt-get purge -yyq --auto-remove \
   task-desktop x11-common fdutils  \
   '*ubuntu-desktop*' \
   '*X11*' '*wayland*' '*xdmcp*' '*gtk*' '*gnome*' 'x11-*' '*font*' \
   '*orca*' '*bluez*' '*bluetooth*' '*audio*' '*desktop*' '*laptop*' \
   '*acpi*' '*spell*' '*avahi*' '*-faq*' '*cups*' '*sane*' '*icon*' \
   '*theme*' '*at-spi*' '*software-properties*' '*texlive*' '*xfonts*' \
   'libx11*' 'libice*' 'libxcd*' 'libxdm*' 'libqtcore*' 'libkdecore*' 'kde*'

for meta in ubuntu-desktop task-desktop x11-common; do
  apt-get purge -yyq --auto-remove $(apt-cache depends "$meta" | grep Depends | awk '{print $2}')
done

while deborphan | xargs dpkg -P ; do
  sleep 0.1
  echo Cleaning up orphaned files
done

# Cleanup packages
apt-get -y clean
apt-get -y autoclean
apt-get -y autoremove --purge

# Cleanup files
apt-get remove -y --purge $(dpkg -l | awk '/^rc/{print $2}')
rm -rf /usr/share/man/??
rm -rf /usr/share/man/??_*

# post-cleanup config
systemctl set-default multi-user.target

# post-install
apt-get install -yyq ca-certificates build-essential netbase sudo