Use the full firmware with driver for this LCD:
http://www.raspberrypiwiki.com/index.php/Install_the_image_to_your_raspberry_pi
Install driver to this LCD(User manual): 
http://www.raspberrypiwiki.com/index.php/Install_driver_to_7_inch_Cap_Lcd_800*480

Specifications:

- LCD Type: HDMI TFT

- LCD Interface: USB

- Touch Screen Type: Capacitive

- Touch Screen Controller: STM32-103

- Backlight: LED

- Resolution: 800 x 480 (Pixel)

- Aspect Ratio: 4:3

800*480 (Pixel)

Compatible with Raspberry Pi 3 Model B/2B+/A+/B

For Raspberry Pi， you can run Raspbian and Ubuntu( Ubuntu can only run at PI 3B/2B)

Compatible with BB Black and Banana Pi/Pro

Can also run Windows at your PC (Touch can't work)

USB touch and HDMI display don't occupy any GPIO

Package included:

1 x Touch Screen

1 x HDMI Cable (50cm)

1 x USB Cable (80cm)
1 x Acrylic Stander Holder