The problem seems due to that the usbfs is not mounted on /proc/bus/usb/ but only on /dev/bus/usb. So the udev scripts that use the /proc/bus/usb to upload the firmwares to the attached devices fail to do so since it do not found the respective nodes.
I have found a workaround that I've posted on the duplicate of this bug report here https://bugs.launchpad.net/ubuntu/+source/midisport- firmware/+bug/88923/comments/19 -- Add support for MidiSport USB midi interfaces https://bugs.launchpad.net/bugs/27833 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs