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Your apt sources.list content is malformed, you are missing the distribution
name
Here's a reference for the file format: https://wiki.debian.org/SourcesList
It should be of the form deb http://site.example.com/debian distribution component1 component2 component3
So if you change it to
deb http://packages.ros.org/ros/ubuntu bionic main
It should work.
Based on the above error message I would guess that you have the same problem with your rethinkdb.list
file too