I would like to know how to set a default runlevel? This is to ensure that my computer directly boots at the set level .
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The simpler way is to edit /etc/init/rc-sysinit.conf and change:
env DEFAULT_RUNLEVEL=2
To:
env DEFAULT_RUNLEVEL=N
Where N is the desired runlevel.
The runlevel can be set using kernel parameters. Edit /etc/default/grub, and change:
GRUB_CMDLINE_LINUX="
to
GRUB_CMDLINE_LINUX="N"
Where N is the runlevel you want. Then run:
sudo update-grub
You can also force a one-time boot to a different runlevel by editing the command line from the GRUB menu at boot.
In practice, remember that runlevels 2-5 have no difference in the default Ubuntu setup. So don't expect anything different to happen if you boot to runlevel 3.
