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Installing ros packages should be done using apt install ros-<distro>-<package>. I think what you want is the ros-melodic-urdf package.

Removing system packages can uninstall related packages since they are technically no longer required by the package being removed. When you use the -y flag, it will just go ahead and remove all those packages it feels are no longer needed. In the future, try remove without the -y flag. This will display a list of the packages it feels are unnecessary and you can choose not to remove then.

In this case, you can now install the ros-desktop for core packages or ros-desktop-full for rviz and gazebo and other supporting packages. apt install ros-melodic-desktop-full

Installing ros packages should be done using apt install ros-<distro>-<package>. I think what you want is the ros-melodic-urdf package.

Removing system packages can uninstall related packages since they are technically no longer required by the package being removed. When you use the -y -y flag, it will just go ahead and remove all those packages it feels are no longer needed. In the future, try remove without without the -y flag. This will display a list of the packages it feels are unnecessary and you can choose not to remove then.

In this case, you can now install the ros-desktop for core packages or ros-desktop-full for rviz and gazebo and other supporting packages. apt install ros-melodic-desktop-full