After Ubuntu is powered off and restarted, the cursor in the upper left corner of the black screen flashes and the resolution is low. What should I do if the Ubuntu system display is only 4:3? It is too laggy.

This problem is mainly a graphics card driver issue. Follow the steps to update the graphics card driver
1. Select metapackage and select the proprietary version. Select the version number to select the latest version.
2. Reference for specific steps.
Preface
: The author did not encounter any problems when installing the graphics card driver. The main problem was that the screen brightness could not be adjusted later. I searched and studied many tutorials on the Internet, found out some experiences, and summarized a set of relatively reliable methods for my reference. For reference, everyone is welcome to communicate.

Preparation work:
First, enter the bios to disable secure boot. In fact, most people do not need to do this because it is usually disabled when the Ubuntu system is installed.

Installing the Graphics Card Driver
There are many tutorials on installing the graphics card driver on the Internet. Most of them are installed from the terminal command line, and some are downloaded and installed from the Nvidia official website. I will introduce a relatively simple method here (personal test).
"Applications" -> "Software and Updates" -> "Additional Drivers"
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The original default driver is Nvidia's open source driver. The system will automatically detect the applicable graphics card driver, select the driver with tested, and click "Apply Changes".
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https://blog.csdn.net/jdky123/article/details/119530522

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Origin blog.csdn.net/pvmsmfchcs/article/details/132522806