On most distributions, the default runlevel is stored in the file /etc/inittab, although you may have to consult the guide for your own distribution. If your system typically boots to the X window system with a graphical login and desktop, you must both exit X and change your default runlevel. If your system typically boots to a console with a command prompt, you should not need to change anything. Level 3 typically includes networking services, so if utilities used by the system during installation depend on a remote filesystem, Levels 1 and 2 will be insufficient. Depending on your network setup, runlevels 1, 2 or 3 should be sufficient for installing the Driver. It is good practice to install the NVIDIA Linux Driver while X is not running, and it is a good idea to prevent X from starting on reboot in case there are problems with the installation (otherwise you may find yourself with a broken system that automatically tries to start X, but then hangs during the startup, preventing you from doing the repairs necessary to fix X). The runlevels typically range from 0 to 6, with runlevel 5 typically starting the X window system as part of the services (runlevel 0 is actually a system halt, and 6 is a system reboot). Runlevels in Linux dictate which services are started and stopped automatically when the system boots or shuts down.
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