DBusException: org.freedesktop.UDisks2.Error.NotAuthorizedCanObtain: Not authorized to perform operation
Udisks mount call failed:
Traceback (most recent call last):
  File "/usr/lib64/calibre/calibre/devices/usbms/device.py", line 599, in do_mount
    mount(node)
  File "/usr/lib64/calibre/calibre/devices/udisks.py", line 180, in mount
    u.mount(node_path)
  File "/usr/lib64/calibre/calibre/devices/udisks.py", line 133, in mount
    dbus_interface=self.FILESYSTEM))
  File "/usr/lib64/python2.7/site-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib64/python2.7/site-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)