目前3588的ubuntu20.04的系统是没有登入界面，如果想要打开按照以下操作执行
修改如下：
vi /etc/gdm3/custom.conf      //修改该文件关闭自启动登入  
​
# GDM configuration storage
#
# See /usr/share/gdm/gdm.schemas for a list of available options.
​
[daemon]
# Uncomment the line below to force the login screen to use Xorg
#WaylandEnable=false
​
# Enabling automatic login
AutomaticLoginEnable = false     //修改true为false关闭自动登入
AutomaticLogin = forlinx
​
# 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