With Ubuntu 19.10, the dock shows mounted volume and device icons by default. This article explains how to disable these mounted devices from showing on the Ubuntu Dock, on Ubuntu 19.10, 20.04 (and newer).
How To Hide Mounted Drives From The Dock On Ubuntu 20.04 Or 19.10
With Ubuntu 19.10, the dock shows mounted volume and device icons by default. This article explains how to disable these mounted devices from showing on the Ubuntu Dock, on Ubuntu 19.10, 20.04 (and newer).