Reposting the workaround in bug 1691729 (https://bugs.launchpad.net/ubuntu/+source/linux-firmware-raspi2/+bug/1691729) here because this is the first result googling for: "trying to overwrite '/lib/firmware/brcm/brcmfmac43430-sdio.bin', which is also in package linux-firmware-raspi2 1.20161020-0ubuntu1~0.2~rpi3".
sudo dpkg-divert --divert /lib/firmware/brcm/brcmfmac43430-sdio-2.bin --package linux-firmware-raspi2 --rename --add /lib/firmware/brcm/brcmfmac43430-sdio.bin
Reposting the workaround in bug 1691729 (https:/ /bugs.launchpad .net/ubuntu/ +source/ linux-firmware- raspi2/ +bug/1691729) here because this is the first result googling for: "trying to overwrite '/lib/firmware/ brcm/brcmfmac43 430-sdio. bin', which is also in package linux-firmware- raspi2 1.20161020- 0ubuntu1~ 0.2~rpi3" .
sudo dpkg-divert --divert /lib/firmware/ brcm/brcmfmac43 430-sdio- 2.bin --package linux-firmware- raspi2 --rename --add /lib/firmware/ brcm/brcmfmac43 430-sdio. bin