graphic board debug
450 sudo service lightdm status
452 sudo service lightdm stop
453 sudo dpkg-reconfigure lightdm
454 ps aux |grep gdm
456 sudo kill -9 2583
457 sudo kill -9 2611
458 sudo kill -9 2650
459 ps aux |grep lightdm
460 sudo killall X
461 sudo killall lightdm
462 sudo killall gdm
463 sudo service lightdm start
464 sudo emacs /etc/X11/xorg.conf
465 cd /etc/X11
467 sudo mv xorg.conf xorg.conf.bak
469 cd /var/log
471 less lightdm/lightdm.log
472 sudo less lightdm/lightdm.log
473 sudo startx
474 ls
475 sudo aptitude install nvidia-346-dev nvidia-settings
476* lspci | grep -invidia
477 sudo service lightdm restart
478 cd
479 rm -rf .Xauthority