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I've installed Ubuntu 18.04 to my very old Mac mini and the system isn't able to detect any wireless network, even though the computer is next to the wireless router.

What I have done; Uninstall the driver and installed it again

sudo apt install bcmwl-kernel-source

I've also uninstalled and tried the firmware-b43-installer.

I've also tried playing around with the blacklist, but nothing.

It didn't work either. I've been searching and haven't been able to find an answer that can help me.

Below is my wireless info:

########## wireless info START ##########



Report from: 13 Dec 2018 20:37 +08 +0800



Booted last: 13 Dec 2018 00:00 +08 +0800



Script from: 22 Oct 2018 03:34 UTC +0000



##### release ###########################



Distributor ID: Ubuntu

Description:    Ubuntu 18.04.1 LTS

Release:    18.04

Codename:   bionic



##### kernel ############################



Linux 4.15.0-42-generic #45-Ubuntu SMP Thu Nov 15 19:32:57 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux



Parameters: ro, quiet, splash, vt.handoff=1



##### desktop ###########################



Ubuntu



##### lspci #############################



00:0a.0 Ethernet controller [0200]: NVIDIA Corporation MCP79 Ethernet [10de:0ab0] (rev b1)

    Subsystem: NVIDIA Corporation Apple iMac 9,1 [10de:cb79]

    Kernel driver in use: forcedeth



03:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM4321 802.11a/b/g/n [14e4:4328] (rev 05)

    Subsystem: Apple Inc. AirPort Extreme [106b:0090]

    Kernel driver in use: wl



##### lsusb #############################



Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Bus 004 Device 003: ID 05ac:8216 Apple, Inc. Bluetooth USB Host Controller

Bus 004 Device 002: ID 0a5c:4500 Broadcom Corp. BCM2046B1 USB 2.0 Hub (part of BCM2046 Bluetooth)

Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Bus 003 Device 003: ID 05ac:8242 Apple, Inc. Built-in IR Receiver

Bus 003 Device 002: ID 045e:0800 Microsoft Corp. 

Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub



##### PCMCIA card info ##################



##### rfkill ############################



0: hci0: Bluetooth

    Soft blocked: no

    Hard blocked: no

1: phy0: Wireless LAN

    Soft blocked: no

    Hard blocked: no

2: brcmwl-0: Wireless LAN

    Soft blocked: no

    Hard blocked: no



##### secure boot #######################



This system doesn't support Secure Boot



##### lsmod #############################



wl                   6447104  0

cfg80211              622592  1 wl



##### interfaces ########################



[/etc/network/interfaces]

auto lo

iface lo inet loopback



##### ifconfig ##########################



1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000

    link/loopback <MAC address> brd <MAC address>

    inet 127.0.0.1/8 scope host lo

       valid_lft forever preferred_lft forever

    inet6 ::1/128 scope host 

       valid_lft forever preferred_lft forever

2: enp0s10: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000

    link/ether <MAC 'enp0s10' [IF1]> brd <MAC address>

    inet 10.0.1.13/24 brd 10.0.1.255 scope global dynamic noprefixroute enp0s10

       valid_lft 86200sec preferred_lft 86200sec

    inet6 fe80::f009:76ae:1e7c:2212/64 scope link noprefixroute 

       valid_lft forever preferred_lft forever

3: wlp3s0: <NO-CARRIER,BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state DORMANT group default qlen 1000

    link/ether <MAC 'wlp3s0' [IF2]> brd <MAC address>



##### iwconfig ##########################



lo        no wireless extensions.



enp0s10   no wireless extensions.



wlp3s0    IEEE 802.11  ESSID:off/any  

          Mode:Managed  Access Point: Not-Associated   

          Retry short limit:7   RTS thr:off   Fragment thr:off

          Power Management:off





##### route #############################



default via 10.0.1.1 dev enp0s10 proto dhcp metric 100 

10.0.1.0/24 dev enp0s10 proto kernel scope link src 10.0.1.13 metric 100 

169.254.0.0/16 dev enp0s10 scope link metric 1000 



##### resolv.conf #######################



[777 root '/etc/resolv.conf' -> '../run/systemd/resolve/stub-resolv.conf']



nameserver 127.0.0.53



##### network managers ##################



Installed:



    NetworkManager



Running:



root       616     1  0 20:34 ?        00:00:00 /usr/sbin/NetworkManager --no-daemon



##### NetworkManager info ###############



GENERAL.DEVICE:                         enp0s10

GENERAL.TYPE:                           ethernet

GENERAL.NM-TYPE:                        NMDeviceEthernet

GENERAL.VENDOR:                         NVIDIA Corporation

GENERAL.PRODUCT:                        MCP79 Ethernet (Apple iMac 9,1)

GENERAL.DRIVER:                         forcedeth

GENERAL.DRIVER-VERSION:                 0.64

GENERAL.FIRMWARE-VERSION:               --

GENERAL.HWADDR:                         <MAC 'enp0s10' [IF1]>

GENERAL.MTU:                            1500

GENERAL.STATE:                          100 (connected)

GENERAL.REASON:                         0 (No reason given)

GENERAL.UDI:                            /sys/devices/pci0000:00/0000:00:0a.0/net/enp0s10

GENERAL.IP-IFACE:                       enp0s10

GENERAL.IS-SOFTWARE:                    no

GENERAL.NM-MANAGED:                     yes

GENERAL.AUTOCONNECT:                    yes

GENERAL.FIRMWARE-MISSING:               no

GENERAL.NM-PLUGIN-MISSING:              no

GENERAL.PHYS-PORT-ID:                   --

GENERAL.CONNECTION:                     Wired connection 1

GENERAL.CON-UUID:                       b5f6eb8f-e933-3ac9-b93b-be753336fc05

GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/1

GENERAL.METERED:                        no (guessed)

CAPABILITIES.CARRIER-DETECT:            yes

CAPABILITIES.SPEED:                     1000 Mb/s

CAPABILITIES.IS-SOFTWARE:               no

CAPABILITIES.SRIOV:                     no

WIRED-PROPERTIES.CARRIER:               on

IP4.ADDRESS[1]:                         10.0.1.13/24

IP4.GATEWAY:                            10.0.1.1

IP4.ROUTE[1]:                           dst = 0.0.0.0/0, nh = 10.0.1.1, mt = 100

IP4.ROUTE[2]:                           dst = 10.0.1.0/24, nh = 0.0.0.0, mt = 100

IP4.ROUTE[3]:                           dst = 169.254.0.0/16, nh = 0.0.0.0, mt = 1000

IP4.DNS[1]:                             10.0.1.1

DHCP4.OPTION[1]:                        network_number = 10.0.1.0

DHCP4.OPTION[2]:                        requested_domain_search = 1

DHCP4.OPTION[3]:                        requested_host_name = 1

DHCP4.OPTION[4]:                        requested_time_offset = 1

DHCP4.OPTION[5]:                        requested_domain_name = 1

DHCP4.OPTION[6]:                        requested_rfc3442_classless_static_routes = 1

DHCP4.OPTION[7]:                        requested_broadcast_address = 1

DHCP4.OPTION[8]:                        broadcast_address = 10.0.1.255

DHCP4.OPTION[9]:                        requested_wpad = 1

DHCP4.OPTION[10]:                       requested_netbios_scope = 1

DHCP4.OPTION[11]:                       next_server = 0.0.0.0

DHCP4.OPTION[12]:                       expiry = 1544790848

DHCP4.OPTION[13]:                       dhcp_message_type = 5

DHCP4.OPTION[14]:                       requested_subnet_mask = 1

DHCP4.OPTION[15]:                       dhcp_lease_time = 86400

DHCP4.OPTION[16]:                       ip_address = 10.0.1.13

DHCP4.OPTION[17]:                       requested_domain_name_servers = 1

DHCP4.OPTION[18]:                       requested_interface_mtu = 1

DHCP4.OPTION[19]:                       routers = 10.0.1.1

DHCP4.OPTION[20]:                       requested_static_routes = 1

DHCP4.OPTION[21]:                       requested_ntp_servers = 1

DHCP4.OPTION[22]:                       requested_netbios_name_servers = 1

DHCP4.OPTION[23]:                       requested_routers = 1

DHCP4.OPTION[24]:                       requested_ms_classless_static_routes = 1

DHCP4.OPTION[25]:                       subnet_mask = 255.255.255.0

DHCP4.OPTION[26]:                       domain_name_servers = 10.0.1.1

DHCP4.OPTION[27]:                       dhcp_server_identifier = 10.0.1.1

IP6.ADDRESS[1]:                         fe80::f009:76ae:1e7c:2212/64

IP6.GATEWAY:                            --

IP6.ROUTE[1]:                           dst = ff00::/8, nh = ::, mt = 256, table=255

IP6.ROUTE[2]:                           dst = fe80::/64, nh = ::, mt = 256

IP6.ROUTE[3]:                           dst = fe80::/64, nh = ::, mt = 100

CONNECTIONS.AVAILABLE-CONNECTION-PATHS: /org/freedesktop/NetworkManager/Settings/{1}

CONNECTIONS.AVAILABLE-CONNECTIONS[1]:   b5f6eb8f-e933-3ac9-b93b-be753336fc05 | Wired connection 1



GENERAL.DEVICE:                         wlp3s0

GENERAL.TYPE:                           wifi

GENERAL.NM-TYPE:                        NMDeviceWifi

GENERAL.VENDOR:                         Broadcom Limited

GENERAL.PRODUCT:                        BCM4321 802.11a/b/g/n (AirPort Extreme)

GENERAL.DRIVER:                         wl

GENERAL.DRIVER-VERSION:                 6.30.223.271 (r587334)

GENERAL.FIRMWARE-VERSION:               --

GENERAL.HWADDR:                         <MAC 'wlp3s0' [IF2]>

GENERAL.MTU:                            1500

GENERAL.STATE:                          30 (disconnected)

GENERAL.REASON:                         42 (The supplicant is now available)

GENERAL.UDI:                            /sys/devices/pci0000:00/0000:00:15.0/0000:03:00.0/net/wlp3s0

GENERAL.IP-IFACE:                       --

GENERAL.IS-SOFTWARE:                    no

GENERAL.NM-MANAGED:                     yes

GENERAL.AUTOCONNECT:                    yes

GENERAL.FIRMWARE-MISSING:               no

GENERAL.NM-PLUGIN-MISSING:              no

GENERAL.PHYS-PORT-ID:                   --

GENERAL.CONNECTION:                     --

GENERAL.CON-UUID:                       --

GENERAL.CON-PATH:                       --

GENERAL.METERED:                        unknown

CAPABILITIES.CARRIER-DETECT:            no

CAPABILITIES.SPEED:                     unknown

CAPABILITIES.IS-SOFTWARE:               no

CAPABILITIES.SRIOV:                     no

WIFI-PROPERTIES.WEP:                    yes

WIFI-PROPERTIES.WPA:                    yes

WIFI-PROPERTIES.WPA2:                   yes

WIFI-PROPERTIES.TKIP:                   yes

WIFI-PROPERTIES.CCMP:                   yes

WIFI-PROPERTIES.AP:                     no

WIFI-PROPERTIES.ADHOC:                  yes

WIFI-PROPERTIES.2GHZ:                   yes

WIFI-PROPERTIES.5GHZ:                   yes

CONNECTIONS.AVAILABLE-CONNECTION-PATHS: --



SSID  BSSID  MODE  CHAN  FREQ  RATE  SIGNAL  BARS  SECURITY  ACTIVE  IN-USE 



##### NetworkManager.state ##############



[main]

NetworkingEnabled=true

WirelessEnabled=true

WWANEnabled=true



##### NetworkManager config #############



[[/etc/NetworkManager/conf.d/default-wifi-powersave-on.conf]]

[connection]

wifi.powersave = 3



[[/etc/NetworkManager/NetworkManager.conf]]

[main]

plugins=ifupdown,keyfile

[ifupdown]

managed=false

[device]

wifi.scan-rand-mac-address=no



[[/usr/lib/NetworkManager/conf.d/10-dns-resolved.conf]]

[main]

dns=systemd-resolved



[[/usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf]]

[keyfile]

unmanaged-devices=*,except:type:wifi,except:type:wwan



[[/usr/lib/NetworkManager/conf.d/20-connectivity-ubuntu.conf]]

[connectivity]

uri=http://connectivity-check.ubuntu.com/



[[/usr/lib/NetworkManager/conf.d/no-mac-addr-change.conf]]

[device-mac-addr-change-wifi]

match-device=driver:rtl8723bs,driver:rtl8189es,driver:r8188eu,driver:8188eu,driver:eagle_sdio,driver:wl

wifi.scan-rand-mac-address=no

wifi.cloned-mac-address=preserve

ethernet.cloned-mac-address=preserve



##### NetworkManager profiles ###########



##### Netplan config ####################



[/etc/netplan/01-network-manager-all.yaml]

network:

  version: 2

  renderer: NetworkManager



##### iw reg get ########################



Region: Asia/Singapore (based on set time zone)



global

country 00: DFS-UNSET

    (2402 - 2472 @ 40), (N/A, 20), (N/A)

    (2457 - 2482 @ 20), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN

    (2474 - 2494 @ 20), (N/A, 20), (N/A), NO-OFDM, PASSIVE-SCAN

    (5170 - 5250 @ 80), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN

    (5250 - 5330 @ 80), (N/A, 20), (0 ms), DFS, AUTO-BW, PASSIVE-SCAN

    (5490 - 5730 @ 160), (N/A, 20), (0 ms), DFS, PASSIVE-SCAN

    (5735 - 5835 @ 80), (N/A, 20), (N/A), PASSIVE-SCAN

    (57240 - 63720 @ 2160), (N/A, 0), (N/A)



##### iwlist channels ###################



lo        no frequency information.



enp0s10   no frequency information.



wlp3s0    32 channels in total; available frequencies :

          Channel 01 : 2.412 GHz

          Channel 02 : 2.417 GHz

          Channel 03 : 2.422 GHz

          Channel 04 : 2.427 GHz

          Channel 05 : 2.432 GHz

          Channel 06 : 2.437 GHz

          Channel 07 : 2.442 GHz

          Channel 08 : 2.447 GHz

          Channel 09 : 2.452 GHz

          Channel 10 : 2.457 GHz

          Channel 11 : 2.462 GHz

          Channel 12 : 2.467 GHz

          Channel 13 : 2.472 GHz

          Channel 14 : 2.484 GHz

          Channel 32 : 5.16 GHz

          Channel 34 : 5.17 GHz

          Channel 36 : 5.18 GHz

          Channel 38 : 5.19 GHz

          Channel 40 : 5.2 GHz

          Channel 42 : 5.21 GHz

          Channel 44 : 5.22 GHz

          Channel 46 : 5.23 GHz

          Channel 48 : 5.24 GHz

          Channel 50 : 5.25 GHz

          Channel 52 : 5.26 GHz

          Channel 54 : 5.27 GHz

          Channel 56 : 5.28 GHz

          Channel 58 : 5.29 GHz

          Channel 60 : 5.3 GHz

          Channel 62 : 5.31 GHz

          Channel 64 : 5.32 GHz

          Channel 66 : 5.33 GHz



##### iwlist scan #######################



lo        Interface doesn't support scanning.



enp0s10   Interface doesn't support scanning.



wlp3s0    No scan results



##### module infos ######################



[wl]

filename:       /lib/modules/4.15.0-42-generic/updates/dkms/wl.ko

license:        MIXED/Proprietary

srcversion:     00D38A27B7E3C7B97C238FC

depends:        cfg80211

retpoline:      Y

name:           wl

vermagic:       4.15.0-42-generic SMP mod_unload 

signat:         PKCS#7

signer:         

sig_key:        

sig_hashalgo:   md4

parm:           passivemode:int

parm:           wl_txq_thresh:int

parm:           oneonly:int

parm:           piomode:int

parm:           instance_base:int

parm:           nompc:int

parm:           intf_name:string



[cfg80211]

filename:       /lib/modules/4.15.0-42-generic/kernel/net/wireless/cfg80211.ko

description:    wireless configuration support

license:        GPL

author:         Johannes Berg

srcversion:     62FD05DCC5AEEA290640C3D

depends:        

retpoline:      Y

intree:         Y

name:           cfg80211

vermagic:       4.15.0-42-generic SMP mod_unload 

signat:         PKCS#7

signer:         

sig_key:        

sig_hashalgo:   md4

parm:           bss_entries_limit:limit to number of scan BSS entries (per wiphy, default 1000) (int)

parm:           ieee80211_regdom:IEEE 802.11 regulatory domain code (charp)

parm:           cfg80211_disable_40mhz_24ghz:Disable 40MHz support in the 2.4GHz band (bool)



##### module parameters #################



[cfg80211]

bss_entries_limit: 1000

cfg80211_disable_40mhz_24ghz: N

ieee80211_regdom: 00



##### /etc/modules ######################



##### modprobe options ##################



[/etc/modprobe.d/amd64-microcode-blacklist.conf]

blacklist microcode



[/etc/modprobe.d/blacklist-ath_pci.conf]

blacklist ath_pci



[/etc/modprobe.d/blacklist-bcm43.conf]

blacklist b43

blacklist b43legacy

blacklist ssb

blacklist bcm43xx

blacklist brcm80211

blacklist brcmfmac

blacklist brcmsmac

blacklist bcma



[/etc/modprobe.d/blacklist.conf]

blacklist evbug

blacklist usbmouse

blacklist usbkbd

blacklist eepro100

blacklist de4x5

blacklist eth1394

blacklist snd_intel8x0m

blacklist snd_aw2

blacklist prism54

blacklist bcm43xx

blacklist garmin_gps

blacklist asus_acpi

blacklist snd_pcsp

blacklist pcspkr

blacklist amd76x_edac



[/etc/modprobe.d/blacklist-rare-network.conf]

alias net-pf-3 off

alias net-pf-6 off

alias net-pf-9 off

alias net-pf-11 off

alias net-pf-12 off

alias net-pf-19 off

alias net-pf-21 off

alias net-pf-36 off



[/etc/modprobe.d/intel-microcode-blacklist.conf]

blacklist microcode



[/etc/modprobe.d/iwlwifi.conf]

remove iwlwifi 

(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) 

&& /sbin/modprobe -r mac80211



##### rc.local ##########################



grep: /etc/rc.local: No such file or directory



##### pm-utils ##########################



##### udev rules ########################



##### dmesg #############################



[   24.521772] wlan0: Broadcom BCM4328 802.11 Hybrid Wireless Controller 6.30.223.271 (r587334)

[   24.524406] wl 0000:03:00.0 wlp3s0: renamed from wlan0

[   33.324255] IPv6: ADDRCONF(NETDEV_UP): enp0s10: link is not ready

[   33.324845] forcedeth 0000:00:0a.0 enp0s10: MSI enabled

[   33.325737] IPv6: ADDRCONF(NETDEV_UP): enp0s10: link is not ready

[   33.325745] IPv6: ADDRCONF(NETDEV_CHANGE): enp0s10: link becomes ready

[   33.358689] IPv6: ADDRCONF(NETDEV_UP): wlp3s0: link is not ready (repeated 2 times)

[   61.068099] ERROR @wl_notify_scan_status : 

[   61.068102] wlp3s0 Scan_results error (-22)

[   94.092135] ERROR @wl_notify_scan_status : 

[   94.092138] wlp3s0 Scan_results error (-22)

[  137.068090] ERROR @wl_notify_scan_status : 

[  137.068094] wlp3s0 Scan_results error (-22)

[  157.164073] ERROR @wl_notify_scan_status : 

[  157.164076] wlp3s0 Scan_results error (-22)

[  220.076101] ERROR @wl_notify_scan_status : 

[  220.076104] wlp3s0 Scan_results error (-22)

[  235.745663] ERROR @wl_dev_intvar_get : 

[  239.820131] ERROR @wl_notify_scan_status : 

[  239.820135] wlp3s0 Scan_results error (-22)



########## wireless info END ############

Welcome to Linux!

The last resort regarding getting wireless Broadcom chips to work is often the usage of Windows drivers via Ndiswrapper.
After enabling the multiverse and universe repositories in Ubuntu you can install its GUI by typing: sudo apt-get install ndisgtk.

You should also, as you mentioned, disable/blacklist all the non-used wireless drivers.

I have never used this method myself and I don't know if this method works on a Mac, so please let me know if you encounter a problem.