root@ubuntu:/media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d# sudo umount /media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d/
umount: /media/ubuntu/e1784e0c-eacf-49ed-8873-c0ae2f1a638d: target is busy
        (In some cases useful info about processes that
         use the device is found by lsof(8) or fuser(1).)