I'm running LibreElec on a RPi2. A USB drive that I use to transfer files (the old fashioned way) is seen by LibreElec as a previous incarnation (Linux Mint distro) of what it is now. I understand that this has to do with the drive being mounted and that it has to be unmounted. I have successfully connected to the RPi2 using ssh but get the following when I try to unmount the USB drive:
LibreELEC:/ # unmount /dev/sda
-sh: unmount: not found
Any ideas or pointers? TIA.