sudo apt-get install vim

sudo vim /etc/gdm3/custom.conf

#WaylandEnable=false 

# GDM configuration storage  
#  
# See /usr/share/gdm/gdm.schemas for a list of available options.  
  
[daemon]  
# Uncoment the line below to force the login screen to use Xorg  
WaylandEnable=false
  
# Enabling automatic login  
#  AutomaticLoginEnable = true  
#  AutomaticLogin = user1  
  
# Enabling timed login  
#  TimedLoginEnable = true  
#  TimedLogin = user1  
#  TimedLoginDelay = 10  
  
[security]  
  
[xdmcp]  
  
[chooser]  
  
[debug]  
# Uncomment the line below to turn on debugging  
# More verbose logs  
# Additionally lets the X server dump core if it crashes  
#Enable=true  

重启命令： reboot