Source: nut Followup-For: Bug #806255The 2.7.4 release fixes a bug with new kernels where bcmxcp_usb is unable to initialize:
usb 4-1.1: usbfs: process 13644 (bcmxcp_usb) did not claim interface 0 before use
I've done a NMU backport myself and it fixed this issue, so an upgrade would be very welcome.