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
The system is running in low-graphics mode
原文：https://www.cnblogs.com/nan0121/p/12210726.html