dad@dad-HP-Notebook:~$ sudo modprobe bcmwl [sudo] password for dad: modprobe: FATAL: Module bcmwl not found in directory /lib/modules/5.8.0-25-generic dad@dad-HP-Notebook:~$ cd /lib/modules/5.8.0-25-generic/ dad@dad-HP-Notebook:/lib/modules/5.8.0-25-generic$ find . -name "*bcm*" ./kernel/sound/soc/bcm ./kernel/net/can/can-bcm.ko ./kernel/drivers/mfd/bcm590xx.ko ./kernel/drivers/bcma ./kernel/drivers/bcma/bcma.ko ./kernel/drivers/net/phy/bcm-phy-lib.ko ./kernel/drivers/net/phy/bcm87xx.ko ./kernel/drivers/net/phy/bcm7xxx.ko ./kernel/drivers/net/phy/mdio-bcm-unimac.ko ./kernel/drivers/net/phy/bcm54140.ko ./kernel/drivers/net/ethernet/broadcom/bcmsysport.ko ./kernel/drivers/net/dsa/bcm-sf2.ko ./kernel/drivers/phy/broadcom/phy-bcm-kona-usb2.ko ./kernel/drivers/media/dvb-frontends/bcm3510.ko ./kernel/drivers/usb/host/bcma-hcd.ko ./kernel/drivers/regulator/bcm590xx-regulator.ko ./kernel/drivers/bluetooth/bcm203x.ko ./kernel/drivers/bluetooth/btbcm.ko ./kernel/drivers/input/mouse/bcm5974.ko dad@dad-HP-Notebook:/lib/modules/5.8.0-25-generic$ dad@dad-HP-Notebook:/lib/modules/5.8.0-25-generic$ sudo modprobe wl [sudo] password for dad: modprobe: ERROR: could not insert 'wl': Operation not permitted aroot@dad-HP-Notebook:~# apt install --reinstall bcmwl-kernel-source Reading package lists... Done Building dependency tree Reading state information... Done 0 to upgrade, 0 to newly install, 1 reinstalled, 0 to remove and 0 not to upgrade. Need to get 1,546 kB of archives. After this operation, 0 B of additional disk space will be used. Get:1 http://gb.archive.ubuntu.com/ubuntu groovy/restricted amd64 bcmwl-kernel-source amd64 6.30.223.271+bdcom-0ubuntu7 [1,546 kB] Fetched 1,546 kB in 1s (2,590 kB/s) debconf: Unable to initialise frontend: Dialog debconf: (Dialogue frontend requires a screen at least 13 lines tall and 31 columns wide.) debconf: falling back to frontend: Readline (Reading database ... 202373 files and directories currently installed.) Preparing to unpack .../bcmwl-kernel-source_6.30.223.271+bdcom-0ubuntu7_amd64.de b ... Removing all DKMS Modules Done. Unpacking bcmwl-kernel-source (6.30.223.271+bdcom-0ubuntu7) over (6.30.223.271+b dcom-0ubuntu7) ... Setting up bcmwl-kernel-source (6.30.223.271+bdcom-0ubuntu7) ... debconf: Unable to initialise frontend: Dialog debconf: (Dialogue frontend requires a screen at least 13 lines tall and 31 colu mns wide.) debconf: falling back to frontend: Readline Loading new bcmwl-6.30.223.271+bdcom DKMS files... Building for 5.8.0-25-generic Building for architecture x86_64 Building initial module for 5.8.0-25-generic Configuring Secure Boot ----------------------- Your system has UEFI Secure Boot enabled. UEFI Secure Boot requires additional configuration to work with third-party drivers. [More] The system will assist you in configuring UEFI Secure Boot. To permit the use of third-party drivers, a new Machine-Owner Key (MOK) has been generated. This key now needs to be enrolled in your system's firmware. To ensure that this change is being made by you as an authorized user, and not by an attacker, you must choose a password now and then confirm the change after reboot using the same password, in both the "Enroll MOK" and "Change Secure Boot state" menus that will be presented to you when this system reboots. If you proceed but do not confirm the password upon reboot, Ubuntu will still be able to boot on your system but any hardware that requires third-party drivers to work correctly may not be usable. Enter a password for Secure Boot. It will be asked again after a reboot. password Enter the same password again to verify you have typed it correctly. password Done. wl.ko: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/5.8.0-25-generic/updates/dkms/ depmod.... DKMS: install completed. modprobe: ERROR: could not insert 'wl': Operation not permitted update-initramfs: deferring update (trigger activated) Processing triggers for initramfs-tools (0.137ubuntu12) ... update-initramfs: Generating /boot/initrd.img-5.8.0-25-generic root@dad-HP-Notebook:~#