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"ddcprobe" is an executable in "xresprobe". So please say the main package so that we don't mess up with google.This package is very old one located in Ubuntu Trusty Tahr 14.04. I don't if it works but I will compile and submit it with some tests.Here are sources :http://archive.ubuntu.com/ubuntu/pool/universe/x/xresprobe/xresprobe_0.4.24ubuntu9.tar.gzhttps://launchpad.net/ubuntu/+source/xresprobe/0.4.24ubuntu9 .