On any Linux system running grub with a boot menu, you can specify the runlevel to the init program as follows:
- When the boot menu is displayed, press the up or down arrow key to stop the auto boot process.
- Using the arrow keys, select the kernel that you wish to boot.
- Press the “e” key to edit this boot config.
- Use the arrow keys to select the “kernel …. ” boot command.
- Press the “e” key to edit this boot command.
- Add a runlevel number or the word “single” to the end of the command line.
- Press the “b” key to boot the edited config.