Mount points are empty directories. In GNU/Linux, all filesystems are mounted in one tree, and Ubuntu is a GNU/Linux. You tried to remove that directory using rmdir command. It's OK. But it said permission denied. It is expected to happen. You are not the owner of neither those directories nor the parent directory, /mnt . You must have superuser permissions to remove those. So use sudo which give root permissions like this:
sudo rmdir /unused/mount/point/
It will prompt for the password. Type your password and hit enter. Your password won't be seen, even not dots. That's normal.
Use
sudo rmdir /path/to/mount/pointMount points are empty directories. In GNU/Linux, all filesystems are mounted in one tree, and Ubuntu is a GNU/Linux. You tried to remove that directory using
rmdircommand. It's OK. But it said permission denied. It is expected to happen. You are not the owner of neither those directories nor the parent directory,/mnt. You must have superuser permissions to remove those. So usesudowhich give root permissions like this:It will prompt for the password. Type your password and hit enter. Your password won't be seen, even not dots. That's normal.