每次开机的时候，都无法进入登录界面，需要进入tty2然后手动启动它才可以进入GUI，下面是自启动错误记录：
* lightdm.service - Light Display Manager
   Loaded: loaded (/lib/systemd/system/lightdm.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Fri 2018-11-23 08:19:18 CST; 3min 49s ago
     Docs: man:lightdm(1)
  Process: 2629 ExecStart=/usr/sbin/lightdm (code=exited, status=1/FAILURE)
  Process: 2573 ExecStartPre=/bin/sh -c [ "$(cat /etc/X11/default-display-manager 2>/dev/null)" = "/usr/sbin/lightdm" ] (code=exited, status=0/SUCCESS)
Main PID: 2629 (code=exited, status=1/FAILURE)

Nov 23 08:18:18 localhost systemd[1]: Starting Light Display Manager...
Nov 23 08:18:21 localhost systemd[1]: Started Light Display Manager.
Nov 23 08:19:11 localhost.localdomain lightdm[2629]: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Nov 23 08:19:11 localhost.localdomain lightdm[3173]: PAM unable to dlopen(pam_kwallet.so): /lib/security/pam_kwallet.so: cannot open shared object file: No such file or directory
Nov 23 08:19:11 localhost.localdomain lightdm[3173]: PAM adding faulty module: pam_kwallet.so
Nov 23 08:19:11 localhost.localdomain lightdm[3173]: PAM unable to dlopen(pam_kwallet5.so): /lib/security/pam_kwallet5.so: cannot open shared object file: No such file or directory
Nov 23 08:19:11 localhost.localdomain lightdm[3173]: PAM adding faulty module: pam_kwallet5.so
Nov 23 08:19:12 localhost.localdomain lightdm[3173]: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
Nov 23 08:19:18 localhost.localdomain systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
Nov 23 08:19:18 localhost.localdomain systemd[1]: lightdm.service: Failed with result 'exit-code'.