I've connected my Android tablet to Ubuntu in order to write some code using Intellij. Everything works ok, but now I don't know how to disconnect my tablet. My /media/ and /mnt/ directories are empty and lsusb display this:
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 003: ID 046d:c062 Logitech, Inc.
Bus 004 Device 002: ID 0d62:001c Darfon Electronics Corp. Benq X120 Internet Keyboard Pro
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 007: ID 18d1:0003 <<<---- THE TABLET
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
So, how can I safely disconnect my tablet?
Check the output of mount and if it is definitely not mounted, just unplug it. There is no problem if no process has access to it.
You may be worried that lsusb still display your device, but that is because that command show the usb devices that are available - that is, plugged in.
If you have doubts, try to plug a regular flash usb stick, umount it, (with sudo umount /dev/your_usb_device) and then do lsusb before unplugging it. You'll notice it will still appear there.