post_install() {
cat << EOF
To enable and start the Display Manager, execute:
  systemctl enable xdm-xfreq
  systemctl start xdm-xfreq
Theme is linked from the following file:
  /etc/xdm-xfreq/xdm-theme.rc -> /etc/xdm-xfreq/theme/your-theme.rc
EOF
}

post_upgrade() {
  post_install $1
}