Debian and its derivatives (this includes Trisquel) are a bit unique in that they don't use runlevel to determine whether or not to start X. You can check out http://www.debianadmin.com/debian-and-ubuntu-linux-run-levels.html for more information.

We can't help you specifically with installing the proprietary nVidia driver, however, because helping people install proprietary software is against our guidelines.

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