change runlevel in ubuntu

There is ni /etc/inittab file in Ubuntu because Ubuntu has /etc/event.d/rc-default file

You can fix this problem by editing /etc/event.d/rc-default file
First backup file,

Code:

sudo cp /etc/event.d/rc-default /etc/event.d/rc-default.bakup

Open vi /etc/event.d/rc-default

Code:

sudo vi /etc/event.d/rc-default

Find all lines read as - telinit 2 and replace with telinit 3

Code:

telinit 3

Reboot the system

Debian Linux

Debian, as well as most of the distributions based on it, like early Ubuntu, does not make any distinction between runlevels 2 to 5.

Debian Linux runlevels

ID	Description
0	Halt
1	Single-User mode
2-5	Full Multi-User with console logins and display manager if installed
6	Reboot

[edit] Ubuntu

Ubuntu 6.10 (Edgy Eft) and later contain Upstart as a replacement for the traditional init-process, but they still use the traditional init scripts and Upstart's SysV-rc compatibility tools to start most services and emulate runlevels.