Remove your installation media and reboot when prompted by Ubuntu

On startup, login to your account and setup your hotkeys to enable volume (mute, decrease, increase).

Display brightness can be fixed by setting up a custom keymapping:

sudo apt-get install xdotool

name: Brightness Up command: xdotool key XF86MonBrightnessUp

name: Brightness Down command: xdotool key XF86MonBrightnessDown