I tried to run X, but I get an ``KDENABIO failed (Operation not permitted)'' error when I type startx. What do I do now?
Your system is running at a raised securelevel, is not it? It is, indeed, impossible to start X at a raised securelevel. To see why, look at the init(8) man page.
So the question is what else you should do instead, and you basically have two choices: set your securelevel back down to zero (usually from /etc/rc.conf), or run xdm(1) at boot time (before the securelevel is raised).
See Q: 11.8. for more information about running xdm(1) at boot time.
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