An error was reported when starting Ubuntu:

Problem description

Solution 1

When the message that “your system is running in low graphics mode” appears, press Ctrl + Alt + F1, then login with your credentials. And then, run the following commands: sudo apt get install — re install Ubuntu desktop. Sudo reboot

Solution 2
1

Lightdm failed to start. The red failed prompt is at the far right of the figure above. The error that caused the boot prompt to appear at the beginning

After my practical verification, I found a very effective solution

The first step is to press and hold Ctrl + Alt + F2 ~ F6 to enter the command line mode of Ubuntu

The second step is to type the following command:

sudoapt-getinstallgdm

Since GDM is a display manager program, the failed lightdm is replaced by GDM

Step three, restart

reboot

So far, the problem has been solved. At least we can enter the GUI interface again. It’s just different from the cool login interface before. After all, GDM and lightdm are different software