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更新后 WiFi 停止工作（Ubuntu 14.04 LTS）

tag-icon • tag-icon 14.04 networking drivers wireless broadcom
更新后 WiFi 停止工作（Ubuntu 14.04 LTS）

软件和更新中的附加驱动程序选项卡显示“使用来自 bcmwl-kernel-source (专有) 的 Broadcom 802.11 Linux STA 无线驱动程序源”。

以下是输出sudo lspci -vvnn | grep -A 9 Network

06:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01)
    Subsystem: Dell Wireless 1704 802.11n + BT 4.0 [1028:0016]
    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-
    Interrupt: pin A routed to IRQ 3
    Region 0: Memory at f7200000 (64-bit, non-prefetchable) [disabled] [size=32K]
    Capabilities: [40] Power Management version 3
        Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
        Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=2 PME-
    Capabilities: [58] Vendor Specific Information: Len=78 <?>

输出lspci -knn | grep Net -A3; rfkill list：

06:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01)
    Subsystem: Dell Wireless 1704 802.11n + BT 4.0 [1028:0016]
07:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller [10ec:8136] (rev 07)
    Subsystem: Dell Device [1028:0655]
0: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no

输出modinfo wl | egrep 'file|verm'; uname -a：

filename:       /lib/modules/4.4.0-116-generic/updates/dkms/wl.ko
vermagic:       4.4.0-116-generic SMP mod_unload modversions 
Linux username-Inspiron-3543 4.4.0-116-generic #140~14.04.1-Ubuntu SMP Fri Feb 16 09:25:20 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

运行sudo modprobe wl && dmesg | grep wl出现如下错误：

modprobe: ERROR: could not insert 'wl': Exec format error

输出dpkg -l | grep gcc-5：

ii  gcc-5                                                 5.4.1-2ubuntu1~14.04                                amd64        GNU C compiler
ii  gcc-5-base:amd64                                      5.4.1-2ubuntu1~14.04                                amd64        GCC, the GNU Compiler Collection (base package)
ii  libgcc-5-dev:amd64                                    5.4.1-2ubuntu1~14.04                                amd64        GCC support library (development files)

输出modinfo cfg80211

filename:       /lib/modules/4.4.0-116-generic/kernel/net/wireless/cfg80211.ko
alias:          net-pf-16-proto-16-family-nl80211
description:    wireless configuration support
license:        GPL
author:         Johannes Berg
srcversion:     D2A8E57424453F0D1BE1DBE
depends:        
intree:         Y
vermagic:       4.4.0-116-generic SMP mod_unload modversions retpoline 
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)

答案1

已知这是由于 gcc-5 版本不匹配造成的，我们可以尝试 

sudo apt-get install --reinstall gcc-5 bcmwl-kernel-source
重启

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