How to solve the error of give root password for maintenance

Solution to the error of give root password for maintenance: the linux system cannot be started and cannot enter the operating system due to illegal restart or hard disk failure. When you see the prompt: give root password for maintenance (or type control-D to continue):, you still have the opportunity to remedy it. The method is as follows: 1. after restart, it should be stopped on this interface: give root password for maintenance (or type control-D to continue): enter the password of the root user on the server: *** press enter, you can enter a simple command operation interface. 2. Enter fsck-y and press enter to start file system repair. The time varies from half an hour to eight hours based on the hard disk size. 3. After the repair is completed, enter reboot and press enter to restart the computer. Note: After the file system is fixed, some files may be lost. The lost files are stored in the lost + found directory of the corresponding partition.