.iso have two steps. First mount as loop device (/dev/loop*), then mount that. Reverse for unmount.
Run udisksctl unmount -b /dev/<your-mount> and then udisksctl loop-delete -f /dev/<your-loop>.
Or if that's too difficult, just reboot.
.iso have two steps. First mount as loop device (/dev/loop*), then mount that. Reverse for unmount.
Run udisksctl unmount -b /dev/<your-mount> and then udisksctl loop-delete -f /dev/<your-loop>.
Or if that's too difficult, just reboot.