I think you have misunderstood a little. The drive is automatically mounted when you insert it. The workaround is to manually unmount it before hitting the format button.
-- usb-creator format button silently fails on mounted drive https://bugs.launchpad.net/bugs/469569 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs