If you accidentally set the init level in the/etc/inittab file to 6 (restart) or do not support the level, the system will not start properly. This blog explains how to solve this problem through grub.
1. During the Linux boot process, press ESC to enter the Grub interface
2. Press E to modify the current Linux system configuration
3. Select the second row, press the E key, and follow the steps below
1) Add 1 (single user mode) after the command line that appears;
2) Press the ENTER key to receive the operation and back to the current Linux configuration page;
3) Press B to restart Linux.
4. After rebooting, enter the Linux system and modify the/etc/inittab file. Change the init level to what you want, like I'm here to change to 3 (full multi-user mode)
Id:3:initdefault
This blog is the original blogger, reproduced please attach the original blog address: http://blog.csdn.net/jeff_fangji/article/details/43916085
Linux/etc/inittab files have the init level set to 6 (restart) or do not support level resolution