1. Your GPU instance is installed with a graphics driver.
When you log in to a GPU instance via VNC, the VGA device emulated by QEMU is accessed by default to obtain the framebuffer of the operating system for login. After you install a graphics driver on the GPU instance, the framebuffer will no longer be handled by the VGA device. As a result, you cannot log in to the operating system via VNC.
2. The operating system failed to start due to other causes. For example, third-party software that conflicts with the operating system is installed on the GPU instance.
Solution
1. If the GPU instance is installed with a graphics driver, install a VNC server on the instance so that you can log in to the GPU instance via a local VNC client.
You need to obtain the VNC server and the client installation packages by yourself.
2. Check the installed third-party software and analyze why the software leads to login failures.
We recommend that you uninstall the conflicting third-party software or reinstall the operating system.
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