[linux] After night elf 9 automatically upgrades the BIOS, it cannot enter the dual system

1. Problem description

After night elf 9 automatically upgrades the BIOS, it cannot enter the dual system, and there is no "multi-boot menu"

2. Solution

1) Enter the BIOS
The key to enter the BIOS for HP Night Elf 9 isF10

2) Set startup items
need to set three

功能键延时：5秒
安全启动模式：关闭
UEFI模式下的开机顺序：ubuntu

3) Set graphics card switching
If the NVIDIA graphics card cannot be used, for example, an error will be reported when using NVIDIA-SMI to view:

NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and running.

You need to set the graphics card switch to Discrete in the BIOS,

3. Extension: Another possibility of NVIDIA-SMI error reporting is that the driver needs to be upgraded

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