This bug might be related:
https://bugs.launchpad.net/ubuntu/+source/usb-creator/+bug/457737
The workaround there in comment #10 didn't work for me though.
This bug might be related:
https:/ /bugs.launchpad .net/ubuntu/ +source/ usb-creator/ +bug/457737
The workaround there in comment #10 didn't work for me though.