Public bug reported:

Package "linux-firmware" (latest version 1.173.8 published on
2019-07-03) does not contain the correct wifi firmware files
/lib/firmware/brcm/brcmfmac43455-sdio.bin and
/lib/firmware/brcm/brcmfmac43430-sdio.bin, so this error repeats:

Jul 04 14:34:42 ubuntu kernel: brcmfmac: brcmf_sdio_hostmail: mailbox indicates 
firmware halted
Jul 04 14:34:45 ubuntu kernel: brcmfmac: brcmf_sdio_bus_rxctl: resumed on 
timeout
Jul 04 14:34:48 ubuntu kernel: brcmfmac: brcmf_sdio_bus_rxctl: resumed on 
timeout
Jul 04 14:34:48 ubuntu kernel: brcmfmac: brcmf_pno_clean: failed code -110
Jul 04 14:34:55 ubuntu kernel: brcmfmac: brcmf_sdio_bus_rxctl: resumed on 
timeout
Jul 04 14:34:55 ubuntu kernel: brcmfmac: brcmf_run_escan: error (-110)
Jul 04 14:34:55 ubuntu kernel: brcmfmac: brcmf_cfg80211_scan: scan error (-110)

To solve this issue, I must copy by hand these files from:
https://github.com/RPi-Distro/firmware-nonfree/raw/master/brcm/brcmfmac43455-sdio.bin
https://github.com/RPi-Distro/firmware-nonfree/raw/master/brcm/brcmfmac43430-sdio.bin

Raspberry Pi 3B/3B+
Ubuntu Server: 18.04.2 LTS (Bionic Beaver)
Architecture: arm64
Package linux-firmware: 1.173.8
Package linux-firmware-raspi2: 1.20180919-0ubuntu0.18.04.2

Note: Both packages "linux-firmware" and "linux-firmware-raspi2" contain
the files brcmfmac43455-sdio.bin and brcmfmac43430-sdio.bin. See related
bug "linux-firmware-raspi2 conflicts with linux-firmware over
brcmfmac43430-sdio.bin" https://bugs.launchpad.net/ubuntu/+source/linux-
firmware-raspi2/+bug/1691729

** Affects: linux-firmware (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1836730

Title:
  Raspberry Pi 3 brcmfmac error (brcmfmac43455-sdio.bin &
  brcmfmac43430-sdio.bin)

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