Linux username and hostname

The default setup is as follows:

• username - uav
• hostname - uavXX (uav1, uav2 etc, according to the number of UAVs the client is ordering)
• password - f4f

In the install screen of Ubuntu 20.04, the values should be filled as follows:

• Your name: uav
• Your computer's name: uav1 (or uav2, uav3 etc.)
• Pick a username: uav
• Choose a password: f4f