I try to use my RasPi3 headless with plugged in ethernet cable and wifi deactivated. The OS is the latest Ubuntu MATE 16.
Unfortunately in 80% I cannot connect to it over SSH. (I always wait long enough - at least 2 minutes.)
Sometimes (not often) it works instantly.
But then when I connect it to HDMI it seems to be connected to Ethernet correctly. Afterwards I can connect over SSH.
There are two possibilities in my opinion. Maybe it won't connect to ethernet unless it is connected to a monitor or SSH is not working until it is connected to a monitor.
Do you know this issue?
Thank you in advance.