My latest workaround is to run from the command-line, in a fresh
terminal:

    unset DBUS_SESSION_BUS_ADDRESS 
    sudo usb-creator-gtk --allow-system-internal

This provided a working boot media for me after several repeat runs
hitting the bug in this thread. I am using bash shell (Ubuntu's
default), so change the unset call if you are running a different shell.
I found the variable to unset by running `env | grep -i dbus`.

I found this workaround based on the clue from @cppege-david-9ei9ny
regarding a segfault log in syslog related to dbus. I found this in my
/var/log/syslog:

    May 10 19:40:03 hostname kernel: [ 9015.534921] usb-creator-
gtk[13914]: segfault at 4 ip 00007f2d37ae2820 sp 00007fff9c185c88 error
6 in libdbus-1.so.3.5.8[7f2d37abe000+42000]

OS: Ubuntu 12.04 x86_64 with all system updates applied. I'm running a
dbus/fluxbox X session and not ubuntu-desktop.

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https://bugs.launchpad.net/bugs/859539

Title:
  usb-creator-gtk fails to install bootloader: "System policy prevents
  installing the bootloader"

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