Ubuntu startup mode

  
 Show current default target 
 sudo systemctl get-default 
 To start in multi-user mode (text mode) 
 sudo systemctl set-default multi-user.target 
   To start in graphical mode (X mode) 
 sudo systemctl set-default graphical.target 
   
   
 https://askubuntu.com/questions/870221/booting-into-text-mode-in-16-04