為了方便觀察 X Window 啟動錯誤，且先安裝
sudo apt install xserver-xorg-legacy
，修改預設值︰
pi@raspberrypi:~
在確定 lightdm 當下組構後︰
pi@raspberrypi:~
![/usr/sbin/lightdm --show-config [Seat:*] B greeter-session=pi-greeter B greeter-hide-users=false A session-wrapper=/etc/X11/Xsession B autologin-user=pi Sources: A /usr/share/lightdm/lightdm.conf.d/01_debian.conf B /etc/lightdm/lightdm.conf pi@raspberrypi:~](http://www.freesandal.org/wp-content/ql-cache/quicklatex.com-870f4e36c3f77f91980e3f9158de56a2_l3.png "Rendered by QuickLaTeX.com")
啟動 lightdm.service systemd 服務，果以失敗告終︰
pi@raspberrypi:~sudo systemctl status lightdm.service ● lightdm.service - Light Display Manager Loaded: loaded (/lib/systemd/system/lightdm.service; enabled; vendor preset: enabled) Active: failed (Result: exit-code) since Fri 2017-10-20 17:05:45 CST; 2s ago Docs: man:lightdm(1) Process: 709 ExecStart=/usr/sbin/lightdm (code=exited, status=1/FAILURE) Process: 705 ExecStartPre=/bin/sh -c [ "
![(cat /etc/X11/default-display-manager 2>/dev/null)" = "/us Main PID: 709 (code=exited, status=1/FAILURE) 10月 20 17:05:45 raspberrypi systemd[1]: lightdm.service: Main process exited, code=exited, status=1/F 10月 20 17:05:45 raspberrypi systemd[1]: lightdm.service: Unit entered failed state. 10月 20 17:05:45 raspberrypi systemd[1]: lightdm.service: Failed with result 'exit-code'. 10月 20 17:05:45 raspberrypi systemd[1]: lightdm.service: Service hold-off time over, scheduling resta 10月 20 17:05:45 raspberrypi systemd[1]: Stopped Light Display Manager. 10月 20 17:05:45 raspberrypi systemd[1]: lightdm.service: Start request repeated too quickly. 10月 20 17:05:45 raspberrypi systemd[1]: Failed to start Light Display Manager. 10月 20 17:05:45 raspberrypi systemd[1]: lightdm.service: Unit entered failed state. 10月 20 17:05:45 raspberrypi systemd[1]: lightdm.service: Failed with result 'exit-code'. pi@raspberrypi:~](http://www.freesandal.org/wp-content/ql-cache/quicklatex.com-738417d8cad3e59f393183a47fb04add_l3.png "Rendered by QuickLaTeX.com")
為明原因，因此用 xinit 直接執行 X11/Starting Sessions 也。
pi@raspberrypi:~
再加上
python3 ~/kivy/examples/demo/pictures/main.py
，運作正常。
當真懸疑的很呦！
嘗聞樹莓派論壇曾經有人談起︰
Boot: ‘Failed to start Light Display Manager.’
Yesterday I started my RasPi 2 and it booted up normally, but then it shows the text ‘[FAILED] Failed to start Light Display Manager. See “systemctl status lightdm.service” for details.’ The result can be found here:
https://www.dropbox.com/s/e1kaqldzo9hz9 … 9.jpg?dl=0.
‘journalctl -u lightdm’ returns ‘No journal files were found.’.
The internet didn’t help so I hope some of you guys can help me out.
https://www.dropbox.com/s/e1kaqldzo9hz9 … 9.jpg?dl=0.
‘journalctl -u lightdm’ returns ‘No journal files were found.’.
The internet didn’t help so I hope some of you guys can help me out.
那時不以為意，誰知眼前就遇之矣？
竟然換個螢幕就 OK 了呦◎
