Public bug reported: When I upgraded an older Macbook Air (running Ubuntu 18.04.4) from kernel 4.15 to 5.5, the wifi adapter no longer worked. The system was reporting that there were no wifi adapters found.
I did research, tried some of the suggested changes (mostly installing the DEB package with the Broadcom kernel source) and had no luck getting wifi to work. Installed kernel 5.3.18 and the wifi adapter is found and is working. cat /proc/version_signature returns 'no such file' lscpi -vnvn returns (for the wifi adapter): 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:0117] 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 0 Region 0: Memory at b0600000 (64-bit, non-prefetchable) [size=32K] Region 2: Memory at b0400000 (64-bit, non-prefetchable) [size=2M] Capabilities: [48] Power Management version 3 Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+) Status: D3 NoSoftRst+ PME-Enable- DSel=0 DScale=2 PME- Capabilities: [58] MSI: Enable- Count=1/1 Maskable- 64bit+ Address: 0000000000000000 Data: 0000 Capabilities: [68] Vendor Specific Information: Len=44 <?> Capabilities: [ac] Express (v2) Endpoint, MSI 00 DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <4us, L1 unlimited ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset- SlotPowerLimit 10.000W DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported- RlxdOrd+ ExtTag- PhantFunc- AuxPwr+ NoSnoop+ MaxPayload 128 bytes, MaxReadReq 1024 bytes DevSta: CorrErr- UncorrErr+ FatalErr- UnsuppReq- AuxPwr+ TransPend- LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <2us, L1 <32us ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+ LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- CommClk+ ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt- LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt- DevCap2: Completion Timeout: Range ABCD, TimeoutDis+, LTR+, OBFF Via WAKE# DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR+, OBFF Disabled LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis- Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS- Compliance De-emphasis: -6dB LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete-, EqualizationPhase1- EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest- Capabilities: [100 v1] Advanced Error Reporting UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol- UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol- UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol- CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr- CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+ AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn- Capabilities: [13c v1] Device Serial Number 48-d7-00-ff-ff-00-00-01 Capabilities: [150 v1] Power Budgeting <?> Capabilities: [160 v1] Virtual Channel Caps: LPEVC=0 RefClk=100ns PATEntryBits=1 Arb: Fixed- WRR32- WRR64- WRR128- Ctrl: ArbSelect=Fixed Status: InProgress- VC0: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans- Arb: Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256- Ctrl: Enable+ ID=0 ArbSelect=Fixed TC/VC=ff Status: NegoPending- InProgress- Capabilities: [1b0 v1] Latency Tolerance Reporting Max snoop latency: 3145728ns Max no snoop latency: 3145728ns Capabilities: [220 v1] #15 Kernel modules: bcma lsb_release returns: Description: Ubuntu 18.04.4 LTS Release: 18.04 apt-cache for the driver kernel source returns: bcmwl-kernel-source: Installed: 6.30.223.271+bdcom-0ubuntu5 Candidate: 6.30.223.271+bdcom-0ubuntu5 Version table: *** 6.30.223.271+bdcom-0ubuntu5 100 100 /var/lib/dpkg/status 6.30.223.271+bdcom-0ubuntu5~18.04.1 500 500 http://us.archive.ubuntu.com/ubuntu bionic-updates/restricted amd64 Packages 6.30.223.271+bdcom-0ubuntu4 500 500 http://us.archive.ubuntu.com/ubuntu bionic/restricted amd64 Packages What I expected to happen: Wifi connection (and icon showing in status bar) What happened instead: WiFi adapter not found. ** Affects: linux (Ubuntu) Importance: Undecided Status: Incomplete ** Tags: bionic -- 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