The system is running in low-graphics mode

No internet

1.Ctrl + Alt + F1

2.login 

3.input the code below:

sudo chown lightdm:lightdm -R /var/lib/lightdm
sudo chown avahi-autoipd:avahi-autoipd -R /var/lib/avahi-autoipd
sudo chown colord:colord -R /var/lib/colord
sudo reboot

　　

原文链接：https://blog.csdn.net/lyy14011305/article/details/76316197