아래와 같은 에러가 발생하지 않습니까?

Xwrapper: no modules loaded for `xserver' service
Authentication failed - cannot start X server.
Perhaps you do not have console ownership?
_X11TransSocketUNIXConnect: Can't connect: errno = 2
_X11TransSocketUNIXConnect: Can't connect: errno = 2
_X11TransSocketUNIXConnect: Can't connect: errno = 2
giving up.
xinit:  No such file or directory (errno 2):  unable to connect to X server
xinit:  No such process (errno 3):  Server error.

원인:
XFree86을 깔 때 PAM지원 여부를 물어보는 질문에 Yes(default!)
라고 답하면 생기는 문제입니다.

해결:
/etc/pam.conf에 다음 줄을 추가합니다.
## for XFree86 3.3.6 above
xserver auth    sufficient      pam_permit.so
xserver account sufficient      pam_permit.so

xdm     auth    sufficient      pam_permit.so
xdm     account sufficient      pam_permit.so
xdm     session sufficient      pam_permit.so

참고:
man pam(8)