Comment 2 for bug 175182

Yup. As I said, I did confirm that removing brltty appears to work around the issue. I am reporting the bug because this truly is a problem, even though there is a workaround -- you should not have to remove a standard and obscure part of a default install just to get a usb to serial adaptor working. What are you supposed to do if you actually need to use brltty? And it did not appear that this issue was documented in launchpad yet.