[Bug 1380041] Re: Erasing NTFS formatted flash raises AttributeError: 'NoneType' object has no attribute 'get_cached_property'

[Yu Ning]

I tested on a trusty box, with usb-creator-{common,gtk} 0.2.56.3 I can
erase the ntfs usbstick without popup error.

However there is one thing to mention, after the erasing it prompt
"There is not enough free space for this image" and the "Make Startup
Disk" button is inactivated. After another erasing now the button is
activated and I can burn the ISO image successfully.

Anyway I think the issue is properly fixed, I'll update the tags for
trusty.

** Tags removed: verification-needed
** Tags added: verification-done

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Title:
  Erasing NTFS formatted flash raises AttributeError: 'NoneType' object
  has no attribute 'get_cached_property'

Status in usb-creator package in Ubuntu:
  Fix Released
Status in usb-creator source package in Trusty:
  Fix Committed

Bug description:
  When I'm trying to erase USB flash I'm get popup with following stack
  trace:

  org.freedesktop.DBus.Python.AttributeError: 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 218, in Format
      parent_dev = _get_parent_object(udisks, device)
    File "/usr/share/usb-creator/usb-creator-helper", line 49, in _get_parent_object
      parent = partition.get_cached_property('Table').get_string()
  AttributeError: 'NoneType' object has no attribute 'get_cached_property'

  To workaround this problem I've done:
  1. Remove existing partition on flash drive in GParted.
  2. Create new FAT32 partition for whole flash drive in GParted.
  3. Unplug/plug flash drive.
  4. Start usb-creator-gtk --- "Make Startup Disk" now active and works.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: usb-creator-gtk 0.2.56.2
  ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
  Uname: Linux 3.13.0-35-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sat Oct 11 12:00:17 2014
  InstallationDate: Installed on 2014-01-01 (282 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  SourcePackage: usb-creator
  UpgradeStatus: Upgraded to trusty on 2014-04-27 (166 days ago)

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