I am using the
ubuntu:16.04 image, but apparently it doesn't have the
hexdump package (because some other stuff I do in the image are failing because of it). So, I tried to
apt-get install hexdump but got an error
E: Unable to locate package hexdump.
When I search for info online it seems like this package should be installed with Ubuntu by default, but maybe in the Docker image it was stripped out. And thus I can't really find sources for how to install it.