install lightdm

Package configuration

 ┌──────────────────────────┤ Configuring lightdm ├──────────────────────────┐
 │                                                                           │
 │ A display manager is a program that provides graphical login              │
 │ capabilities for the X Window System.                                     │
 │                                                                           │
 │ Only one display manager can manage a given X server, but multiple        │
 │ display manager packages are installed. Please select which display       │
 │ manager should run by default.                                            │
 │                                                                           │
 │ Multiple display managers can run simultaneously if they are configured   │
 │ to manage different servers; to achieve this, configure the display       │
 │ managers accordingly, edit each of their init scripts in /etc/init.d,     │
 │ and disable the check for a default display manager.                      │
 │                                                                           │
 │                                  <Ok>                                     │
 │                                                                           │
 └───────────────────────────────────────────────────────────────────────────┘