Comment 3 for bug 1446646

From the UsbCreatorLog.txt:

usb-creator 2015-04-21 07:43:35,964 (DEBUG) install.py:232: install_bootloader
usb-creator 2015-04-21 07:43:47,676 (CRITICAL) install.py:99: Failed to install the bootloader.
usb-creator 2015-04-21 07:43:47,678 (ERROR) frontend.py:737: Installation failed.
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/usbcreator/install.py", line 257, in install_bootloader
    timeout=MAX_DBUS_TIMEOUT)
  File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 70, in __call__
    return self._proxy_method(*args, **keywords)
  File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python3/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Python.OSError: 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 226, in InstallBootloader
    popen([syslinux_exe, '-f', device])
  File "/usr/lib/python3/dist-packages/usbcreator/misc.py", line 169, in popen
    startupinfo=startupinfo)
  File "/usr/lib/python3.4/subprocess.py", line 859, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.4/subprocess.py", line 1457, in _execute_child
    raise child_exception_type(errno_num, err_msg)
OSError: [Errno 8] Exec format error