After installing Ubuntu Linux 18.04

Update system
sudo apt update && sudo apt upgrade

Restricted drivers
Software & Update -> Additional Drivers

VLC
sudo apt-get install vlc -y

GIMP
sudo apt-get install gimp -y

Multimedia support
sudo apt-get install ubuntu-restricted-extras

System clean
sudo apt-get autoclean
sudo apt-get clean
sudo apt-get autoremove

Further Info:
Odroid XU4Q