以下を参考にしました。

Adding PIXEL to Raspbian Lite https://gist.github.com/kmpm/8e535a12a45a32f6d36cf26c7c6cef51

1. Raspbian Stretch Liteをインストール
   https://www.raspberrypi.org/downloads/raspbian/
   
2. Update
   

   sudo apt update
   sudo apt upgrade

   # you only have to reboot if there were any updates that needed it
   # if unsure do it anyway
   sudo reboot

3. Adding PIXEL
   
   sudo apt-get install -y raspberrypi-ui-mods rpi-chromium-mods
   sudo reboot