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从 12.04 升级到 14.04 后，wifi 无法使用

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从 12.04 升级到 14.04 后，wifi 无法使用

有线网络工作正常，只是没有 WiFi。

$ lspci -v | grep -iA7 network

0b:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)
Subsystem: Dell Wireless 1395 WLAN Mini-Card
Flags: bus master, fast devsel, latency 0, IRQ 17
Memory at fe7fc000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: b43-pci-bridge

$ lsmod | grep b43-pci-bridge

$ lsmod | grep b43

b43                   387371  0 
bcma                   52096  1 b43
mac80211              626489  1 b43
cfg80211              484040  2 b43,mac80211
ssb                    62379  1 b43

$ nm-tool

NetworkManager Tool

State: connected (global)

- Device: eth0  [Wired connection 1] -------------------------------------------
  Type:              Wired
  Driver:            sky2
  State:             connected
  Default:           yes
  HW Address:        00:21:9B:ED:A6:84

  Capabilities:
    Carrier Detect:  yes
    Speed:           100 Mb/s

  Wired Properties
    Carrier:         on

  IPv4 Settings:
    Address:         192.168.1.8
    Prefix:          24 (255.255.255.0)
    Gateway:         192.168.1.1

    DNS:             192.168.1.1

答案1

请执行以下操作：

sudo apt-get purge b43-fwcutter firmware-b43-installer
sudo apt-get update
sudo apt-get install linux-firmware-nonfree

重启

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