ERROR: default sources list file already exists: /etc/ros/rosdep/sources.list.d/20-default.list

ERROR: default sources list file already exists:
/etc/ros/rosdep/sources.list.d/20-default.list
Please delete if you wish to re-initialize

sudo rm /etc/ros/rosdep/sources.list.d/20-default.list
sudo rosdep init