Comment # 7 on bug 1001554 from Dominique Leuenberger

(In reply to Ronan Chagas from comment #6)
> Guys,
> 
> I found something really weird. I cannot use `umount` as user to unmount the
> device. However, if I run the following command as an user:
> 
> udisksctl unmount -b /dev/sdb1
> 
> then the device is unmounted properly.

nothing weird - normal behavior; but udisk is what nautilus should fire off to
do the umount too (well, through the dbus api)