NoMachine service should use a monochrome icon on Ubuntu MATE using the Ambiance theme, instead of the red logo icon it currently uses.

A user with proper permissions can work around the issue by executing the following commands:

sudo cp -a /usr/NX/share/images/tray-ubuntu.png /usr/NX/share/images/tray-linux.png
sudo cp -a /usr/NX/share/images/tray-ubuntu-faded.png /usr/NX/share/images/tray-linux-faded.png