Can you try gnome-disks utility (Or just "Disks" in the unity dash) to format
the drive?
If that fails as well, it's a bug in udisks package.
If that works fine, than it's a bug in usb-creator.
Interestingly sdb is shown as rotational media in the logs. And usb-
creator should be used to erase rotational media.
** Changed in: usb-creator (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1114545
Title:
Startup Disk Creator fails when erasing disk
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