What is a run level in Linux and to change system run level?

Hello

I would like to understand the meaning of run level in a Linux system. And how can i change the run level of
my system. Am using Ubuntu 14.04 64-bit.

Thanks… …

@aaronkili45

Please describe your question clearly in 250 characters…

In linux there are 7 (0,…,6) runlevels once look at the below article it may help you

and setting default runlevel in Ubuntu fallow the below steps

vim /etc/init/rc-sysinit.conf

and change the below line

env DEFAULT_RUNLEVEL=2

This article re-enforces the above. You may want to go through it if you need a little ore information.
http://www.unixmen.com/linux-runlevels/

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