At the start of the system boot process, access the boot menu (you may or may
not need to press a key to do this??”watch the screen prompts closely), highlight
the menu entry you wish to use, and press A (to append kernel arguments).
Table 2-1. The standard runlevels observed by most System V Unix variants and Linux
Runlevel Description
0 Halt
s, S Single-user mode: no per-runlevel scripts executed; /etc/inittab not required (emergency
use only)
1 Single-user maintenance mode
2 Multiuser, nonnetworked mode (the default runlevel for Debian-based systems,
including Ubuntu, but rarely used on other systems)
3 Multiuser, networked mode
4 Unused
5 Multiuser, networked mode with local graphical login
6 Reboot
7, 8, 9, a, b, c Unused
2.5
2.5 Enabling or Disabling the Display Manager at Boot Time 29
2. You will be taken into an editor mode that lets you adjust the kernel boot arguments.
Add the number 3 at the end of the argument line and press Enter to
boot.
If you are using a system that uses Xen virtualization, the kernel entry
specifies the hypervisor instead of the Linux kernel. To edit the kernel
boot parameters, press E (for Edit) at the main grub menu, which will
display the details of your boot configuration.
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