How to solve the problem of Ubuntu 18.04 looping login/stuck on the boot interface/unable to enter the graphical interface

Cause: NVIDIA graphics card driver is damaged

Solution:

1. Reboot into command line mode
2. Uninstall the original NVIDIA driver
3. Reinstall the NVIDIA driver and restart to solve the problem

Step 1: Boot the Ubuntu system into command line mode

After the system starts, press the "ESC" key in the BIOS boot interface to enter the selection menu, select the first "*Ubuntu", and press the "e" key to enter the editing mode.

In the edit item that appears, you can see the parameters that GRUB parses for the kernel. We give the boot runlevel at the end of the line, 3 (multi-user mode, text only).

Press CTRL+X or F10 to boot the system, and it will enter command line mode after startup. This method is only temporary and not permanent. After the next system restart, if no changes are made, it will still enter the graphical interface mode.

Step 2: Uninstall NVIDIA driver

Login user in command line interface

Uninstall any old drivers

sudo apt-get remove nvidia-*
sudo apt-get autoremove

Uninstall the driver via the .run file

sudo nvidia-uninstall

Restart the system and enter the graphical interface normally, but since there is no graphics card driver at this time, the system resolution is low.

sudo reboot

Step 3: Reinstall NVIDIA graphics driver

Manual installation is recommended. NVIDIA driver download address:

https://www.nvidia.cn/Download/index.aspx?lang=cn/

Stop the graphical interface and enter command line mode

sudo telinit 3

User login

cd to the path where the driver installation program is located

Run the .run file using bash or the ./ command

bash NVIDIA******.run

Restart the system and the problem is solved.

sudo reboot

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