Comment 18 for bug 1578745

That command errors out:

Adding 'diversion of /lib/firmware/brcm/brcmfmac43430-sdio.bin to /lib/firmware/brcm/brcmfmac43430-sdio-2.bin by linux-firmware-raspi2'
dpkg-divert: error: rename involves overwriting '/lib/firmware/brcm/brcmfmac43430-sdio-2.bin' with
  different file '/lib/firmware/brcm/brcmfmac43430-sdio.bin', not allowed

# dpkg-divert --list
diversion of /usr/sbin/grub-set-default to /usr/sbin/grub-set-default.real by grub-legacy-ec2
diversion of /usr/share/man/man1/sh.1.gz to /usr/share/man/man1/sh.distrib.1.gz by dash
diversion of /usr/share/vim/vim74/doc/tags to /usr/share/vim/vim74/doc/tags.vim-tiny by vim-runtime
diversion of /usr/share/vim/vim74/doc/help.txt to /usr/share/vim/vim74/doc/help.txt.vim-tiny by vim-runtime
diversion of /etc/init/ureadahead.conf to /etc/init/ureadahead.conf.disabled by cloud-init
diversion of /bin/sh to /bin/sh.distrib by dash
diversion of /usr/share/initramfs-tools/hooks/klibc to /usr/share/initramfs-tools/hooks/klibc^i-t by klibc-utils