Mount the downloaded Ubuntu 16.04.6 .iso file
Select your language
Select “Install Ubuntu Server”
Select your OS language
Select your location/ country
Select your keyboard layout and language
Set your hostname
Set your Name: <your name> + Loginname: <your username>
Enter Password
Choose to encrypt or not encrypt your home directory
Select timezone (Europe/Berlin)
Select “default partitions” or customize them if you want (lvm is recommended)
Wait until the installation is over
Restart and eject (unmount) the .iso file
Select GRUB as bootloader