Comment 26 for bug 1208129

Same issue today after update. Ubuntu 14.04.2 LTS - Error: An uncaught exception was raised:
unorderable types: NoneType() <= str()

kernel 3.13.0-51-generic #84-Ubuntu SMP Wed Apr 15 12:11:46 UTC 2015 i686 i686 i686 GNU/Linux

usb-creator-gtk --version
0.2.23

Trying to use an old pmagic_2013_08_01.iso on 4GB Transcend flash drive

Same result with or without reserved extra space (persistence)

Erase disk works as expected

dpkg.log for today:
2015-04-23 14:40:28 startup archives unpack
2015-04-23 14:40:29 upgrade usb-creator-gtk:i386 0.2.56.3 0.2.56.3ubuntu0.1
2015-04-23 14:40:29 status half-configured usb-creator-gtk:i386 0.2.56.3
2015-04-23 14:40:29 status unpacked usb-creator-gtk:i386 0.2.56.3
2015-04-23 14:40:29 status half-installed usb-creator-gtk:i386 0.2.56.3
2015-04-23 14:40:29 status triggers-pending hicolor-icon-theme:all 0.13-1
2015-04-23 14:40:29 status half-installed usb-creator-gtk:i386 0.2.56.3
2015-04-23 14:40:29 status triggers-pending man-db:i386 2.6.7.1-1ubuntu1
2015-04-23 14:40:29 status triggers-pending bamfdaemon:i386 0.5.1+14.04.20140409-0ubuntu1
2015-04-23 14:40:29 status half-installed usb-creator-gtk:i386 0.2.56.3
2015-04-23 14:40:29 status triggers-pending desktop-file-utils:i386 0.22-1ubuntu1
2015-04-23 14:40:29 status half-installed usb-creator-gtk:i386 0.2.56.3
2015-04-23 14:40:29 status triggers-pending mime-support:all 3.54ubuntu1.1
2015-04-23 14:40:29 status triggers-pending gnome-menus:i386 3.10.1-0ubuntu2
2015-04-23 14:40:29 status half-installed usb-creator-gtk:i386 0.2.56.3
2015-04-23 14:40:29 status unpacked usb-creator-gtk:i386 0.2.56.3ubuntu0.1
2015-04-23 14:40:29 status unpacked usb-creator-gtk:i386 0.2.56.3ubuntu0.1
2015-04-23 14:40:29 upgrade usb-creator-common:i386 0.2.56.3 0.2.56.3ubuntu0.1
2015-04-23 14:40:29 status half-configured usb-creator-common:i386 0.2.56.3
2015-04-23 14:40:30 status unpacked usb-creator-common:i386 0.2.56.3
2015-04-23 14:40:30 status half-installed usb-creator-common:i386 0.2.56.3
2015-04-23 14:40:30 status half-installed usb-creator-common:i386 0.2.56.3
2015-04-23 14:40:30 status unpacked usb-creator-common:i386 0.2.56.3ubuntu0.1
2015-04-23 14:40:30 status unpacked usb-creator-common:i386 0.2.56.3ubuntu0.1
2015-04-23 14:40:30 upgrade wpasupplicant:i386 2.1-0ubuntu1.1 2.1-0ubuntu1.2
2015-04-23 14:40:30 status half-configured wpasupplicant:i386 2.1-0ubuntu1.1
2015-04-23 14:40:30 status unpacked wpasupplicant:i386 2.1-0ubuntu1.1
2015-04-23 14:40:30 status half-installed wpasupplicant:i386 2.1-0ubuntu1.1
2015-04-23 14:40:30 status half-installed wpasupplicant:i386 2.1-0ubuntu1.1
2015-04-23 14:40:30 status unpacked wpasupplicant:i386 2.1-0ubuntu1.2
2015-04-23 14:40:30 status unpacked wpasupplicant:i386 2.1-0ubuntu1.2
2015-04-23 14:40:30 trigproc hicolor-icon-theme:all 0.13-1 0.13-1
2015-04-23 14:40:30 status half-configured hicolor-icon-theme:all 0.13-1
2015-04-23 14:40:31 status installed hicolor-icon-theme:all 0.13-1
2015-04-23 14:40:31 trigproc man-db:i386 2.6.7.1-1ubuntu1 2.6.7.1-1ubuntu1
2015-04-23 14:40:31 status half-configured man-db:i386 2.6.7.1-1ubuntu1
2015-04-23 14:40:32 status installed man-db:i386 2.6.7.1-1ubuntu1
2015-04-23 14:40:32 trigproc bamfdaemon:i386 0.5.1+14.04.20140409-0ubuntu1 0.5.1+14.04.20140409-0ubuntu1
2015-04-23 14:40:32 status half-configured bamfdaemon:i386 0.5.1+14.04.20140409-0ubuntu1
2015-04-23 14:40:32 status installed bamfdaemon:i386 0.5.1+14.04.20140409-0ubuntu1
2015-04-23 14:40:32 trigproc desktop-file-utils:i386 0.22-1ubuntu1 0.22-1ubuntu1
2015-04-23 14:40:32 status half-configured desktop-file-utils:i386 0.22-1ubuntu1
2015-04-23 14:40:32 status installed desktop-file-utils:i386 0.22-1ubuntu1
2015-04-23 14:40:32 trigproc mime-support:all 3.54ubuntu1.1 3.54ubuntu1.1
2015-04-23 14:40:32 status half-configured mime-support:all 3.54ubuntu1.1
2015-04-23 14:40:32 status installed mime-support:all 3.54ubuntu1.1
2015-04-23 14:40:32 trigproc gnome-menus:i386 3.10.1-0ubuntu2 3.10.1-0ubuntu2
2015-04-23 14:40:32 status half-configured gnome-menus:i386 3.10.1-0ubuntu2
2015-04-23 14:40:32 status installed gnome-menus:i386 3.10.1-0ubuntu2
2015-04-23 14:40:32 startup packages configure
2015-04-23 14:40:32 configure usb-creator-common:i386 0.2.56.3ubuntu0.1 <none>
2015-04-23 14:40:32 status unpacked usb-creator-common:i386 0.2.56.3ubuntu0.1
2015-04-23 14:40:32 status unpacked usb-creator-common:i386 0.2.56.3ubuntu0.1
2015-04-23 14:40:32 status half-configured usb-creator-common:i386 0.2.56.3ubuntu0.1
2015-04-23 14:40:32 status installed usb-creator-common:i386 0.2.56.3ubuntu0.1
2015-04-23 14:40:32 configure usb-creator-gtk:i386 0.2.56.3ubuntu0.1 <none>
2015-04-23 14:40:32 status unpacked usb-creator-gtk:i386 0.2.56.3ubuntu0.1
2015-04-23 14:40:32 status half-configured usb-creator-gtk:i386 0.2.56.3ubuntu0.1
2015-04-23 14:40:32 status installed usb-creator-gtk:i386 0.2.56.3ubuntu0.1
2015-04-23 14:40:33 configure wpasupplicant:i386 2.1-0ubuntu1.2 <none>
2015-04-23 14:40:33 status unpacked wpasupplicant:i386 2.1-0ubuntu1.2
2015-04-23 14:40:33 status unpacked wpasupplicant:i386 2.1-0ubuntu1.2
2015-04-23 14:40:33 status unpacked wpasupplicant:i386 2.1-0ubuntu1.2
2015-04-23 14:40:33 status unpacked wpasupplicant:i386 2.1-0ubuntu1.2
2015-04-23 14:40:33 status unpacked wpasupplicant:i386 2.1-0ubuntu1.2
2015-04-23 14:40:33 status half-configured wpasupplicant:i386 2.1-0ubuntu1.2
2015-04-23 14:40:33 status installed wpasupplicant:i386 2.1-0ubuntu1.2