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I had encountered the same error. I overcome doing the following steps:-
1.This command will remove gazebo9 ,catkin , python-rospkg , python-rospkg-modules packages from your system
sudo apt-get remove gazebo9* catkin python-rospkg python-rospkg-modules
2.This command will remove packages from your system, for example, to remove ros related files:
sudo apt-get remove ros-*
3.This command will remove packages and their configuration files.
sudo apt-get purge ros-*
4.sudo apt-get remove ros-melodic-desktop-full
5.sudo apt-get purge ros-melodic-desktop-full
6.This command will remove dependencies that are no longer needed.
sudo apt-get autoremove
7.sudo apt-get install -f
8.sudo apt-get update
9.sudo apt-get upgrade
10.Now install ros-melodic-desktop-full
sudo apt install ros-melodic-desktop-full
References:link text