What should I do if Centos cannot be started after unplugging it from a USB flash drive?

The solution to the problem that the U disk cannot be started after unplugging the U disk after installing Centos: first switch to the root user and enter grub mode; then edit [grub.conf] and enter grub mode again to execute relevant statements; finally restart That’s it.

Solution to the problem that Centos cannot be started after uninstalling the USB disk after installing Centos:

1. Switch to the root user

#su -- root

2. Enter grub mode

#grub

3. Follow the steps below

grub>find 
/boot/grub/stage1或者find /grub/stage1

Generally, something similar to (hd0,5) will be returned. Remember it. .

grub>quit

4. Edit grub.conf

#vim /boot/grub/grub.conf

Replace all occurrences of (hdx, y) in the file with the values ​​obtained in step 3

5. Re- Enter grub mode and perform the following steps. Note that there is a space between the two commands below.

grub>root  (hdx,y)   
grub>setup (hdx)
grub>quit

6. Restart

#shutdown -r now

Recommended related tutorials: centos tutorial

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