This error indicates that the boot code on the hard disk is missing
Experimental preparation steps
1) Preparation: dd if=/dev/zero of=/dev/nvme0n1 bs=446 count=1
2) Screenshot of system startup error report
The repair steps are as follows
Step 1: select boot from CD to enter rescue mode
Select the third
Select the second
Select 1) continue
Enter directly
Step 2: switch to the real root file system
chroot /mnt/sysimage
Step 3: repair the boot program
grub2-install /dev/nvme0n1
Step 4: exit twice, restart the test, and choose to start from the local disk
It has been repaired successfully
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