how to install pcl

http://larrylisky.com/2014/03/03/installing-pcl-on-ubuntu/

monitor flicker ubuntu

http://ubuntuforums.org/showthread.php?t=2243912

nvidia graphic driver install

http://ubuntuhandbook.org/index.php/2014/04/install-nvidia-driver-331-67-ubuntu1404/

http://ubuntuhandbook.org/index.php/2014/06/nvidia-driver-337-25/

http://ubuntuhandbook.org/index.php/2014/09/nvidia-343-22-install-in-ubuntu-1404/

http://askubuntu.com/questions/464354/update-nvidia-drivers-with-xorg-edgers-ppa

 http://askubuntu.com/questions/464354/update-nvidia-drivers-with-xorg-edgers-ppa

http://askubuntu.com/questions/464354/update-nvidia-drivers-with-xorg-edgers-ppa

http://askubuntu.com/questions/309239/nvidia-driver-install

http://ubuntuforums.org/showthread.php?t=2215359

http://askubuntu.com/questions/61396/how-do-i-install-the-nvidia-drivers/508255#508255

http://askubuntu.com/questions/522953/nvidia-update-video-driver

http://ubuntuforums.org/showthread.php?t=2247205&page=2

http://askubuntu.com/questions/455393/after-clean-install-of-14-04-there-are-no-nvidia-drivers-available

grub rescue

http://unix.stackexchange.com/questions/148041/recovering-from-grub-rescue-crash