Please I am new to ubuntu 14.04 and i can't adjust my screen brightness. I'm using HP Pro book-450-G2. but i dual boot the ubuntu with windows 10 and my brightness can be adjusted in windows 10.
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You can install xbacklight with sudo apt-get install xbacklight, and then try xbacklight -set 10.
If that does not work, then open up the folder /sys/class/backlight/ and see if there are any entries. If not, then you probably don't have your video drivers installed.
Edit: OK, the following seems to have worked for OP: Brightness setting not working on Xubuntu 15.04 ( vivid vervet)
