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I just started using Ubuntu on my old MacBook, and the WiFi doesn't work. When I go to the WiFi settings, it says "No Wi-Fi Adapter Found". I went to Software & Updates>Additional Drivers, and tried to install network drivers, but when I clicked "apply changes" it said "error while applying changes pk-client-error-quark: Cannot download packages whilst offline (257)". Before I installed Ubuntu, I booted it off of a live USB, and the WiFi worked just fine, but now it doesn't. I can confirm that it is not a hardware problem, because when I booted into mac OS, the WiFi worked. I am using Ubuntu 20.04.1 LTS.

04:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM4331 802.11a/b/g/n [14e4:4331] (rev 02)
    Subsystem: Apple Inc. AirPort Extreme [106b:00ef]
    Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
    Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 0, Cache Line Size: 256 bytes
    Interrupt: pin A routed to IRQ 17
    Region 0: Memory at c1900000 (64-bit, non-prefetchable) [size=16K]
    Capabilities: <access denied>
    Kernel driver in use: bcma-pci-bridge
    Kernel modules: bcma
Simon Sudler
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1 Answers1

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This will get you going however it would be much easier if you can connect to the internet using you phone or a USB dongle.
b43 driver (Open-source) is the one you want

darth_epoxy
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