usb-creator-kde can't erase USB disk

[Alvin]

Steps to reproduce
1. Start usb-creator-kde
2. Select an USB disk and click 'Erase Disk'
3. Fill in password

This error appears:

org.freedesktop.DBus.Python.GLib.Error: Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/dbus/service.py", line 707, in _message_cb
    retval = candidate_method(self, *args, **keywords)
  File "/usr/share/usb-creator/usb-creator-helper", line 287, in Format
    partition = table.call_create_partition_sync(0, size, '0x0c', '', no_options, None)
GLib.Error: udisks-error-quark: GDBus.Error:org.freedesktop.UDisks2.Error.Failed: Error wiping newly created partition /dev/sdf1: Command-line `wipefs -a "/dev/sdf1"' exited with non-zero exit status 1: wipefs: error: /dev/sdf1: probing initialization failed: No such file or directory
 (0)

It's not entirely clear if the USB disk is wiped or not. Behaviour of usb-creator-kde is inconsistent. Sometimes it can't be closed, or sometimes an .iso file can't be selected because the window does not appear after clicking 'Other'.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: usb-creator-kde 0.2.67ubuntu0.1
ProcVersionSignature: Ubuntu 3.19.0-25.26-generic 3.19.8-ckt2
Uname: Linux 3.19.0-25-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.2
Architecture: amd64
CurrentDesktop: KDE
Date: Tue Aug 11 14:14:43 2015
InstallationDate: Installed on 2015-04-24 (109 days ago)
InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
SourcePackage: usb-creator
UDisksDump: Error: [Errno 2] No such file or directory: 'udisks'
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.