我刚刚从 14.04 更新到 Ubuntu 16.04。我之前没有检查我的 WiFi 连接，但现在我想使用 WiFi。但是，当我尝试使用我的 WiFi 时，它没有显示在列表中，我无法使用它。
我不知道该怎么办。
ifconfig :
eth0 Link encap:Ethernet HWaddr a4:ba:db:c3:a7:da
inet addr:192.168.2.33 Bcast:192.168.2.255 Mask:255.255.255.0
inet6 addr: fe80::a6ba:dbff:fec3:a7da/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:71031 errors:0 dropped:0 overruns:0 frame:0
TX packets:1925 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5047517 (5.0 MB) TX bytes:266195 (266.1 KB)
Interrupt:18
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:5 errors:0 dropped:0 overruns:0 frame:0
TX packets:5 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:289 (289.0 B) TX bytes:289 (289.0 B)
ppp0 Link encap:Point-to-Point Protocol
inet addr:172.18.202.149 P-t-P:10.0.1.1 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Metric:1
RX packets:1561 errors:0 dropped:0 overruns:0 frame:0
TX packets:1722 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:829243 (829.2 KB) TX bytes:204197 (204.1 KB)
###################################
iwconfig
wlan0 IEEE 802.11abg ESSID:off/any
Mode:Managed Access Point: Not-Associated
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
ppp0 no wireless extensions.
lo no wireless extensions.
eth0 no wireless extensions.
###################################
lshw :
*-network DISABLED
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: wlan0
version: 01
serial: 78:e4:00:2a:8f:7e
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=wl0 driverversion=6.30.223.248 (r487574) latency=0 multicast=yes wireless=IEEE 802.11abg
resources: irq:17 memory:f69fc000-f69fffff
*-network
description: Ethernet interface
product: 88E8040 PCI-E Fast Ethernet Controller
vendor: Marvell Technology Group Ltd.
physical id: 0
bus info: pci@0000:09:00.0
logical name: eth0
version: 13
serial: a4:ba:db:c3:a7:da
size: 100Mbit/s
capacity: 100Mbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=sky2 driverversion=1.30 duplex=full ip=192.168.2.33 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
resources: irq:28 memory:f68fc000-f68fffff ioport:de00(size=256)
###################################
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: Marvell Technology Group Ltd. 88E8040 PCI-E Fast Ethernet Controller (rev 13)
0c:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)
###################################
lspci -knn | grep Net -A2 :
0c:00.0 Network controller [0280]: Broadcom Corporation BCM4312 802.11b/g LP-PHY [14e4:4315] (rev 01)
Subsystem: Dell Wireless 1397 WLAN Mini-Card [1028:000c]
Kernel driver in use: wl
###################################
rfkill :
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
1: brcmwl-0: Wireless LAN
Soft blocked: no
Hard blocked: yes
###################################
scan :
ppp0 Interface doesn't support scanning.
wlan0 Failed to read scan data : Network is down
lo Interface doesn't support scanning.
eth0 Interface doesn't support scanning.
###################################
如果需要更多信息，请告诉我。
正如您所提到的，输出如下：
sudo apt purge bcmwl-kernel-source ：已成功执行
sudo apt install firmware-b43-installer: 执行此操作后，我得到如下结果：
Reading package lists... Done
Building dependency tree
Reading state information... Done
firmware-b43-installer is already the newest version (1:019-2).
The following packages were automatically installed and are no longer required:
dkms gstreamer0.10-gconf lame libaften0 libavcodec54 libavdevice53
libavfilter3 libavformat54 libavresample1 libavutil52 libfaac0 libfdk-aac0
libgdict-common liblavfile-2.1-0 liblavjpeg-2.1-0 liblavplay-2.1-0
libopenjpeg2 libquicktime2 librhythmbox-core8 librtmp0 libswscale2 libvpx1
libx264-142 mjpegtools mjpegtools-gtk rhythmbox-mozilla twolame
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
之后，我通过软件更新将设备更改为 BCM4312 设备并重新启动系统。设备正在使用备用驱动程序。
它仍然不起作用。
答案1
您安装了错误的无线驱动程序。连接到互联网并运行以下命令
sudo apt purge bcmwl-kernel-source
sudo apt install firmware-b43-installer