Select the module line
that specifies the kernel file and press E. Add the desired runlevel (3) at
the end of this line and press Enter to save your change, then press B to
boot.
Or, if you are using the LILO bootloader:
1. At the start of the system boot process, access the LILO: prompt, then type the
name of the boot configuration you wish to use (the Tab key will display the list
of possibilities) and append the number 3 at the end (for example, linux 3).
2. Press Enter to boot.
You can change the runlevel of system after it has been booted by executing the init
or telinit command with the desired runlevel:
$ init 3
To return to the graphical login state, switch to runlevel 5:
$ init 5
Permanently changing the default runlevel requires editing /etc/initab. The runlevel is
controlled by this line:
id:5:initdefault:
Change the second field to 3 to disable the automatic start-up of the display
manager:
id:3:initdefault:
When you boot into any runlevel that does not start X automatically, you can start
the display manager manually by typing the command name at a root shell prompt:
# gdm
By default, Debian-based systems (including Ubuntu) start the display
manager in all runlevels.
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