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The rosdep DB is here: ros/rosdistro/rosdep, in most cases you'll want to look at base.yaml.

The rosdep DB is here: ros/rosdistro/rosdep, in most cases you'll want to look at base.yaml.

My understanding from reading this (https://answers.ros.org/question/320734/cannot-locate-rosdep-definition/) is that rosdep looked for a package that is named lamp.

No, not quite. rosdep tries to lookup the key lamp in the database. Note the difference: a key has to be resolved to a package name. It's not a package name itself, unless it's the name of a ROS package. But then you would most likely get a different error.