Could you paste output of `dpkg -l|grep linux-.*5.5.8` and `dkms status`? It works just fine on Focal with same v5.5.8 mainline kernel:
$ dpkg -l|grep linux-.*5.5.8 | awk '{print $2}' linux-headers-5.5.8-050508 linux-headers-5.5.8-050508-generic linux-image-unsigned-5.5.8-050508-generic linux-modules-5.5.8-050508-generic $ dkms status broadcom-sta, 6.30.223.271, 5.5.8-050508-generic, x86_64: installed 03:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM4360 802.11ac Wireless Network Adapter [14e4:43a0] (rev 03) Subsystem: Apple Inc. BCM4360 802.11ac Wireless Network Adapter [106b:0112] Kernel driver in use: wl -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1866697 Title: Kernel 5.5.x Does Not Support BCM4360 WiFi Adapter To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1866697/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs