Need to report that the Broadcom BCM43228 wifi card intermittently shows
the Wi-Fi networks. It will show them only occasionally; usually after a
cold boot. If the machine is rebooted, the Wi-Fi networks disappear.
Can anyone tell me how to test a wifi card for hardware failure?

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https://bugs.launchpad.net/bugs/1882242

Title:
  June 4th network-manager update kills wireless networking

Status in network-manager package in Ubuntu:
  New

Bug description:
  network-manager problems

  June 4, 2020 apt update installed two networking packages:
  network-manager_1.14.6-2+deb10u1_amd64.deb
  libnm0_1.14.6-2+deb10u1_amd64.deb

  System:
    Kernel: 5.4.0-33-generic x86_64 
    Desktop: MATE 1.24.0 
    Distro: Ubuntu 20.04 LTS (Focal Fossa) 
  Machine:
    Type: Laptop System: Dell product: Latitude E6530 v: 01 

  After rebooting the laptop, the wireless access point(s) are no longer
  available in the Network Manager.  The "Enable Wi-Fi" is checked. "Wi-
  Fi Networks" is grayed out.

  Network:
    Device-2: Broadcom and subsidiaries BCM43228 802.11a/b/g/n driver: wl 
    IF: wlp2s0 state: dormant mac: 3c:77:e6:7c:5d:7b

  $ sudo ip addr

  wlp2s0: <NO-CARRIER,BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel 
state DORMANT group default qlen 1000
      link/ether 3c:77:e6:7c:5d:7b brd ff:ff:ff:ff:ff:ff

  $ sudo nmcli
  wlp2s0: disconnected
          "Broadcom and subsidiaries BCM43228"
          wifi (wl), 3C:77:E6:7C:5D:7B, hw, mtu 1500

  $ sudo nmcli device show
  GENERAL.DEVICE:                         wlp2s0
  GENERAL.TYPE:                           wifi
  GENERAL.HWADDR:                         3C:77:E6:7C:5D:7B
  GENERAL.MTU:                            1500
  GENERAL.STATE:                          30 (disconnected)
  GENERAL.CONNECTION:                     --
  GENERAL.CON-PATH:                       --

  $ sudo nmcli radio wifi
  enabled

  $ sudo iwlist wlp2s0 scanning
  wlp2s0    No scan results

  $ sudo iwlist wlp2s0 accesspoints
  wlp2s0    Interface doesn't have a list of Peers/Access-Points

  $ sudo iwlist wlp2s0 ap
  wlp2s0    Interface doesn't have a list of Peers/Access-Points

  $ sudo iwlist wlp2s0 wpakeys
  wlp2s0    2 key sizes : 40, 104bits
            4 keys available :
  Error reading wpa keys (SIOCGIWENCODEEXT): Operation not supported

  $ sudo iwconfig wlp2s0
  wlp2s0    IEEE 802.11  ESSID:off/any  
            Mode:Managed  Access Point: Not-Associated   Tx-Power=200 dBm   
            Retry short limit:7   RTS thr:off   Fragment thr:off
            Encryption key:off
            Power Management:on

  $ sudo rfkill list
  1: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
  2: brcmwl-0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
  3: dell-wifi: Wireless LAN
        Soft blocked: no
        Hard blocked: no

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