post.sh

#!/bin/bash

if ! [ $(id -u) = 0 ]
then
  echo "Run as root"
  exit 1
fi

if [ -e ~/.xmodmaprc ];then
  xmodmap ~/.xmodmaprc
else
  echo "keycode 94=grave asciitilde" > ~/.xmodmaprc
  xmodmap ~/.xmodmaprc
fi

# APT
sed -i 's/main/main contrib non-free/g' /etc/apt/sources.list
echo 'deb http://ftp.debian.org/debian stretch-backports main' > /etc/apt/sources.list.d/stretch-backports.list

# Guest-Additions
apt-get update && apt-get upgrade -y
apt-get install build-essential module-assistant git gdebi zsh curl locate openvpn sudo
m-a prepare

echo "Install Guest Additions from the Devices menu"
read -p "Press [Enter] when done"

mount /media/cdrom
sh /media/cdrom/VBoxLinuxAdditions.run

# greeter
GREETER='/etc/lightdm/lightdm-gtk-greeter.conf'
sed -i 's/#background=/background=#000000/' $GREETER
sed -i 's/#theme-name=/theme-name=Adwaita-dark/' $GREETER
sed -i 's/#icon-theme-name=/icon-theme-name=Vibrancy-Colors-Dark/' $GREETER
sed -i 's/#font-name=/font-name=Sans 9/' $GREETER
sed -i 's/#xft-dpr=/xft-dpi=86/' $GREETER