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I have installed Ubuntu 20.04, but the wifi interface is hard blocked. I tried to install firmware-b43-installer and to insert the brcm80211 module manually but no luck. Is there a known solution for this?

$ rfkill list all
0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: yes

$ sudo lshw -C network
*-network DISABLED
   description: Wireless interface
   product: BCM4313 802.11bgn Wireless Network Adapter
   vendor: Broadcom Inc. and subsidiaries
   physical id: 0
   bus info: pci@0000:04:00.0
   logical name: wlp4s0b1
   version: 01
   serial: 70:f1:a1:ca:27:b5
   width: 64 bits
   clock: 33MHz
   capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
   configuration: broadcast=yes driver=brcmsmac driverversion=5.4.0-31-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11
   resources: irq:17 memory:f0300000-f0303fff

$ lspci -knn | grep Net -A3; rfkill list
04:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM4313 802.11bgn Wireless Network Adapter [14e4:4727] (rev 01)
    Subsystem: Dell Inspiron M5010 / XPS 8300 [1028:0010]
    Kernel modules: bcma, wl
05:00.0 Ethernet controller [0200]: Qualcomm Atheros AR8152 v1.1 Fast Ethernet [1969:2060] (rev c1)
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  • For Broadcom Wi-Fi I think you should install broadcom-sta-dkms and broadcom-sta-common packages . Those worked in my case. It doesn't need to insert any additional firmwares.
    – Parsa Mousavi
    May 28, 2020 at 13:20
  • Please edit your question and add output of lspci -knn | grep Net -A3; rfkill list terminal command.
    – Pilot6
    May 28, 2020 at 13:26
  • Just forgot to mention , you should insert the kernel module after the installation via " sudo modprobe wl ".
    – Parsa Mousavi
    May 28, 2020 at 13:30
  • @ParsaMousavi Now I have two entries in the list but no connection. $ sudo rfkill list 0: phy0: Wireless LAN Soft blocked: yes Hard blocked: no 1: brcmwl-0: Wireless LAN Soft blocked: no Hard blocked: yes
    – Cosmin Mihai
    May 28, 2020 at 13:32
  • 2
    And hard block means a hardware switch in most cases.
    – Pilot6
    May 28, 2020 at 13:33

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