Install cairo-dock-dustbin-plug-in by entering the following commands in the terminal:
sudo apt update sudo apt install cairo-dock-dustbin-plug-in
Dustbin plug-in for Cairo-dock
A collection of official plug-ins and applets for cairo-dock. . This plug-in manages the dustbin. Users can delete files and unmount disks by drag and dropping them on the icon. This can warn users if they use too much space.