Comment 4 for bug 1691729

For every-body who has this issue, the following command works around it until the package maintainers find a solution:

sudo dpkg-divert --divert /lib/firmware/brcm/brcmfmac43430-sdio-2.bin --package linux-firmware-raspi2 --rename --add /lib/firmware/brcm/brcmfmac43430-sdio.bin

Please note that this will set up a diversion for the conflicting file in your system and may have to be un-done once a permanent solution is found. If the chosen solution is to remove the file from linux-firmware and leave it in linux-firmware-raspi2, then the file /lib/firmware/brcm/brcmfmac43430-sdio.bin will end up missing in your system. In this case you can remove the diversion by replacing --add with --remove in the above command.