可能重复：
如何安装 Broadcom / STA 无线网卡（BCM43XX）
无线功能在 Broadcom BCM4312 上不起作用
我是 Ubuntu 新手。我已在笔记本电脑上安装了 Ubuntu 12.10。无线无法使用。它未检测到可用网络。我可以通过有线连接。
请帮助我通过 wifi 连接。
arun@arunan:~$ lspci
00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 07)
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
00:1a.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 03)
00:1a.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 03)
00:1a.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 03)
00:1a.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2 (rev 03)
00:1c.2 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 3 (rev 03)
00:1c.4 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 5 (rev 03)
00:1d.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 03)
00:1d.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03)
00:1d.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03)
00:1d.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93)
00:1f.0 ISA bridge: Intel Corporation ICH9M LPC Interface Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation 82801IBM/IEM (ICH9M/ICH9M-E) 4 port SATA Controller [AHCI mode] (rev 03)
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 03)
09:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 02)
0c:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)
arun@arunan:~$ sudo lshw -c 网络
*-network UNCLAIMED
description: Network controller
product: BCM4312 802.11b/g LP-PHY
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:0c:00.0
version: 01
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress cap_list
configuration: latency=0
resources: memory:f69fc000-f69fffff
*-network
description: Ethernet interface
product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:09:00.0
logical name: eth0
version: 02
serial: a4:ba:db:de:ce:a2
size: 100Mbit/s
capacity: 100Mbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full ip=192.168.2.9 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
resources: irq:45 ioport:de00(size=256) memory:f0010000-f0010fff memory:f0000000-f000ffff memory:f0020000-f003ffff
arun@arunan:~$ rfkill 列出所有 arun@arunan:~$
型号为Dell Inpsiron 1440
以下是我通过实时 USB 启动并连接无线时获得的结果。
$ sudo lshw -c network
*-network
description: Wireless interface
product: BCM4312 802.11b/g LP-PHY
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:0c:00.0
logical name: eth1
version: 01
serial: 0c:60:76:65:ce:e2
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=wl0 driverversion=5.100.82.112 ip=192.168.2.10 latency=0 multicast=yes wireless=IEEE 802.11bg
resources: irq:17 memory:f69fc000-f69fffff
*-network
description: Ethernet interface
product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:09:00.0
logical name: eth0
version: 02
serial: a4:ba:db:de:ce:a2
size: 10Mbit/s
capacity: 100Mbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:45 ioport:de00(size=256) memory:f0010000-f0010fff memory:f0000000-f000ffff memory:f0020000-f003ffff
答案1
也许您的硬件有点旧；尚不支持最新的操作系统。
您可以安装较旧的 Windows 驱动程序并测试它是否在 Ubuntu 上运行。（Ubuntu 10.04）https://help.ubuntu.com/10.04/internet/C/troubleshooting-wireless.html#troubleshooting-wireless-ndiswrapper
以下是有关安装 Windows 驱动程序的更多信息，以及有关特定硬件的一些信息： https://help.ubuntu.com/community/WifiDocs/Driver/Ndiswrapper
更新我发现 Broadcom 4311 芯片在 Ubuntu 11.x 上停止工作，可能是您使用的 Broadcom 4312 芯片在 Ubuntu 12.x 上有缺陷。尝试bcmwl-kernel-source根据手册安装以下驱动程序 ()，看看它是否有效：
https://help.ubuntu.com/community/WifiDocs/Driver/bcm43xx
答案2
这通常可以解决问题，从 ubuntu 故障排除开始。