Odd behavior with the eth0 interface.
SBC: RockPro64 v2.1
OS: Debian 9.9 (Stretch) [ @Mrfixit2001 ]

When the system boot up, and I log in, there is no Ethernet connection.
- The main panel Ethernet connection widget says the connection is up.
- Command: 'ethtool eth0' response is the connection is up.
- Command 'ip addr ls' response is the connection is up.
- Pings to the default route and to other sites fail.
Using the main panel Ethernet widget, I disconnect, then reconnect
the Ethernet connection, and I have IP connectivity.

This is really troublesome because I want to run my RKP64 headless
along with a Raspi 3B and Odroid XU4. Both the other (2) SBCs are
running Ubuntu 18.04 and the latest version of NoMachine.

NoMachine Arm v7 works fine on the RKP64.

Any ideas, suggestions would be greatly appreciated.

What is the output of:
ip link show
Does changing interfaces from ethx to enpxsy changes anything?
You can try in '/etc/default/grub' on parameter 'GRUB_CMDLINE_LINUX_DEFAULT':
net.ifnames=1 biosdevname=0
or if it doesn't work:
net.ifnames=0 biosdevname=0

Check if it has something to do with eudev renaming interfaces..

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