Our USB Camera is not showing up on QGC

[EliotBR (Eliot)]

@cece

1. 4.1.6 is the version our QGC is on

Our latest recommended version is 4.2.4 - can you try that?

@cece

2. We are using Ubuntu 20.04

Someone has previously reported having a firewall they didn’t know about, which may be worth checking in case the video stream on UDP port 5600 is being blocked.