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I had the same problem. It ended up being Raspbian Stretch is 32 bit architecture as indicated by stretch/main armhf. The repositories that have ros-lunar-desktop-full are in 64 bit which is not armhf. You are able to install the bare bones version of ROS onto Stretch which allows you to communicate to and from the Pi.
To be able to get 64 bit on the Pi I installed a new image from the following: https://github.com/bamarni/pi64/blob/master/README.md then I proceeded as normal to get it to install ros-lunar-desktop. I hope this helps.