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I had the same problem. For me, I ran sudo apt-get install ros-desktop-full before I realized that is not Melodic. I removed that afterwards but I had the same error when I tried to install with sudo apt-get install ros-melodic-desktop-full.
I think the error came from the fact that I had rospkg 1.1.4 instead of 1.1.7 when I installed ros_desktop_full. I did
sudo apt-get remove gazebo9* catkin python-rospkg python-rospkg-modules
(Here, I also removed gazebo9 related packages and catkin that were installed with ros-desktop-full.) Afterwards, I tried to install the melodic desktop full version again and it worked for me.
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