This is not a bug in usb-creator, but ubiquity (the ubuntu installer). I will reassign this bug to the ubiquity package and mark is as a duplicate of Bug #549756
At the last step of ubiquity click the "Advanced" button, it will say that GRUB will be installed to /dev/sda instead of /dev/sdb. Changing it to /dev/sdb using the contextual menu fails and does not change the drive. You must click on the text field and manually type sdb. If you do this it should work for you.
This is not a bug in usb-creator, but ubiquity (the ubuntu installer). I will reassign this bug to the ubiquity package and mark is as a duplicate of Bug #549756
At the last step of ubiquity click the "Advanced" button, it will say that GRUB will be installed to /dev/sda instead of /dev/sdb. Changing it to /dev/sdb using the contextual menu fails and does not change the drive. You must click on the text field and manually type sdb. If you do this it should work for you.