我刚刚在戴尔笔记本电脑上安装了 Ubuntu LTS 16。有线网络可以工作，但 wifi 按钮却不行。没有 wifi 按钮，没有 wifi 检索器……什么都没有。
我尝试重新启动并重新安装但没有任何变化。
我认为，也许，wifi技术还没有发挥作用。
这是我的设备检查的输出。
任何想法？
########## wireless info START ##########
Report from: 17 Dec 2016 00:38 EST -0500
Booted last: 17 Dec 2016 00:00 EST -0500
Script from: 08 Jul 2016 02:16 UTC +0000
##### release ###########################
Distributor ID: Ubuntu
Description: Ubuntu 16.04.1 LTS
Release: 16.04
Codename: xenial
##### kernel ############################
Linux 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
Parameters: ro, quiet, splash, vt.handoff=7
##### desktop ###########################
sed: can't read /root/.dmrc: No such file or directory
Could not be determined.
##### lspci #############################
09:00.0 Ethernet controller [0200]: Broadcom Corporation NetXtreme BCM5755M Gigabit Ethernet PCI Express [14e4:1673] (rev 02)
Subsystem: Dell NetXtreme BCM5755M Gigabit Ethernet PCI Express [1028:01f9]
Kernel driver in use: tg3
0c:00.0 Network controller [0280]: Broadcom Corporation BCM4311 802.11a/b/g [14e4:4312] (rev 01)
Subsystem: Dell Wireless 1490 Dual Band WLAN Mini-Card [1028:0007]
Kernel driver in use: wl
##### lsusb #############################
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 003: ID 0b97:7772 O2 Micro, Inc. OZ776 CCID Smartcard Reader
Bus 007 Device 002: ID 0b97:7761 O2 Micro, Inc. Oz776 1.1 Hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
##### PCMCIA card info ##################
PRODID_1=""
PRODID_2=""
PRODID_3=""
PRODID_4=""
MANFID=0000,0000
FUNCID=255
##### rfkill ############################
0: dell-wifi: Wireless LAN
Soft blocked: no
Hard blocked: no
##### lsmod #############################
wl 6365184 1
dell_wmi 16384 0
dell_laptop 20480 0
sparse_keymap 16384 1 dell_wmi
dcdbas 16384 1 dell_laptop
cfg80211 565248 1 wl
wmi 20480 1 dell_wmi
video 40960 3 i915,dell_wmi,dell_laptop
##### interfaces ########################
auto lo
iface lo inet loopback
##### ifconfig ##########################
enp9s0 Link encap:Ethernet HWaddr <MAC 'enp9s0' [IF1]>
inet addr:192.168.2.133 Bcast:192.168.2.255 Mask:255.255.255.0
inet6 addr: fe80::efd:f9ac:bd92:57a5/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:10269 errors:0 dropped:1 overruns:0 frame:0
TX packets:8287 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:10726306 (10.7 MB) TX bytes:946140 (946.1 KB)
Interrupt:17
##### iwconfig ##########################
enp9s0 no wireless extensions.
lo no wireless extensions.
##### route #############################
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.2.1 0.0.0.0 UG 100 0 0 enp9s0
169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 enp9s0
192.168.2.0 0.0.0.0 255.255.255.0 U 100 0 0 enp9s0
##### resolv.conf #######################
nameserver 127.0.1.1
search home
##### network managers ##################
Installed:
NetworkManager
Running:
root 687 1 0 00:32 ? 00:00:00 /usr/sbin/NetworkManager --no-daemon
##### NetworkManager info ###############
GENERAL.DEVICE: enp9s0
GENERAL.TYPE: ethernet
GENERAL.NM-TYPE: NMDeviceEthernet
GENERAL.VENDOR: Broadcom Corporation
GENERAL.PRODUCT: NetXtreme BCM5755M Gigabit Ethernet PCI Express
GENERAL.DRIVER: tg3
GENERAL.DRIVER-VERSION: 3.137
GENERAL.FIRMWARE-VERSION: 5755m-v3.29
GENERAL.HWADDR: <MAC 'enp9s0' [IF1]>
GENERAL.MTU: 1500
GENERAL.STATE: 100 (connected)
GENERAL.REASON: 0 (No reason given)
GENERAL.UDI: /sys/devices/pci0000:00/0000:00:1c.5/0000:09:00.0/net/enp9s0
GENERAL.IP-IFACE: enp9s0
GENERAL.IS-SOFTWARE: no
GENERAL.NM-MANAGED: yes
GENERAL.AUTOCONNECT: yes
GENERAL.FIRMWARE-MISSING: no
GENERAL.NM-PLUGIN-MISSING: no
GENERAL.PHYS-PORT-ID: --
GENERAL.CONNECTION: Wired connection 1
GENERAL.CON-UUID: 0c64eb3e-6174-3ab3-9f0f-16ce009bfef8
GENERAL.CON-PATH: /org/freedesktop/NetworkManager/ActiveConnection/1
GENERAL.METERED: no (guessed)
CAPABILITIES.CARRIER-DETECT: yes
CAPABILITIES.SPEED: 1000 Mb/s
CAPABILITIES.IS-SOFTWARE: no
WIRED-PROPERTIES.CARRIER: on
CONNECTIONS.AVAILABLE-CONNECTION-PATHS: /org/freedesktop/NetworkManager/Settings/{0}
CONNECTIONS.AVAILABLE-CONNECTIONS[1]: 0c64eb3e-6174-3ab3-9f0f-16ce009bfef8 | Wired connection 1
IP4.ADDRESS[1]: 192.168.2.133/24
IP4.GATEWAY: 192.168.2.1
IP4.ROUTE[1]: dst = 169.254.0.0/16, nh = 0.0.0.0, mt = 1000
IP4.DNS[1]: 192.168.2.1
IP4.DOMAIN[1]: home
DHCP4.OPTION[1]: requested_routers = 1
DHCP4.OPTION[2]: requested_domain_search = 1
DHCP4.OPTION[3]: requested_time_offset = 1
DHCP4.OPTION[4]: requested_domain_name = 1
DHCP4.OPTION[5]: requested_rfc3442_classless_static_routes = 1
DHCP4.OPTION[6]: requested_broadcast_address = 1
DHCP4.OPTION[7]: requested_netbios_scope = 1
DHCP4.OPTION[8]: requested_wpad = 1
DHCP4.OPTION[9]: next_server = 0.0.0.0
DHCP4.OPTION[10]: expiry = 1482212125
DHCP4.OPTION[11]: requested_interface_mtu = 1
DHCP4.OPTION[12]: requested_subnet_mask = 1
DHCP4.OPTION[13]: routers = 192.168.2.1
DHCP4.OPTION[14]: dhcp_message_type = 5
DHCP4.OPTION[15]: ip_address = 192.168.2.133
DHCP4.OPTION[16]: requested_static_routes = 1
DHCP4.OPTION[17]: domain_name = home
DHCP4.OPTION[18]: requested_domain_name_servers = 1
DHCP4.OPTION[19]: broadcast_address = 192.168.2.255
DHCP4.OPTION[20]: requested_ntp_servers = 1
DHCP4.OPTION[21]: requested_netbios_name_servers = 1
DHCP4.OPTION[22]: dhcp_lease_time = 259200
DHCP4.OPTION[23]: domain_name_servers = 192.168.2.1
DHCP4.OPTION[24]: requested_ms_classless_static_routes = 1
DHCP4.OPTION[25]: subnet_mask = 255.255.255.0
DHCP4.OPTION[26]: network_number = 192.168.2.0
DHCP4.OPTION[27]: requested_host_name = 1
DHCP4.OPTION[28]: dhcp_server_identifier = 192.168.2.1
IP6.ADDRESS[1]: fe80::efd:f9ac:bd92:57a5/64
IP6.GATEWAY:
##### NetworkManager.state ##############
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
##### NetworkManager.conf ###############
[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq
[ifupdown]
managed=false
##### NetworkManager profiles ###########
##### iw reg get ########################
Region: America/Toronto (based on set time zone)
country 00: DFS-UNSET
(2402 - 2472 @ 40), (N/A, 20), (N/A)
(2457 - 2482 @ 40), (N/A, 20), (N/A), NO-IR
(2474 - 2494 @ 20), (N/A, 20), (N/A), NO-OFDM, NO-IR
(5170 - 5250 @ 80), (N/A, 20), (N/A), NO-IR
(5250 - 5330 @ 80), (N/A, 20), (0 ms), DFS, NO-IR
(5490 - 5730 @ 160), (N/A, 20), (0 ms), DFS, NO-IR
(5735 - 5835 @ 80), (N/A, 20), (N/A), NO-IR
(57240 - 63720 @ 2160), (N/A, 0), (N/A)
##### iwlist channels ###################
enp9s0 no frequency information.
lo no frequency information.
##### iwlist scan #######################
enp9s0 Interface doesn't support scanning.
lo Interface doesn't support scanning.
##### module infos ######################
[wl]
filename: /lib/modules/4.4.0-21-generic/updates/dkms/wl.ko
license: MIXED/Proprietary
srcversion: 4DDC5FCDB1E30F7DFDCA530
depends: cfg80211
vermagic: 4.4.0-21-generic SMP mod_unload modversions
parm: passivemode:int
parm: wl_txq_thresh:int
parm: oneonly:int
parm: piomode:int
parm: instance_base:int
parm: nompc:int
parm: intf_name:string
[cfg80211]
filename: /lib/modules/4.4.0-21-generic/kernel/net/wireless/cfg80211.ko
description: wireless configuration support
license: GPL
author: Johannes Berg
srcversion: 00D8DA6D3B739DDD31FFF50
depends:
intree: Y
vermagic: 4.4.0-21-generic SMP mod_unload modversions
parm: ieee80211_regdom:IEEE 802.11 regulatory domain code (charp)
parm: cfg80211_disable_40mhz_24ghz:Disable 40MHz support in the 2.4GHz band (bool)
##### module parameters #################
[cfg80211]
cfg80211_disable_40mhz_24ghz: N
ieee80211_regdom: 00
##### /etc/modules ######################
##### modprobe options ##################
[/etc/modprobe.d/blacklist-ath_pci.conf]
blacklist ath_pci
[/etc/modprobe.d/blacklist-bcm43.conf]
blacklist b43
blacklist b43legacy
blacklist ssb
blacklist bcm43xx
blacklist brcm80211
blacklist brcmfmac
blacklist brcmsmac
blacklist bcma
[/etc/modprobe.d/blacklist.conf]
blacklist evbug
blacklist usbmouse
blacklist usbkbd
blacklist eepro100
blacklist de4x5
blacklist eth1394
blacklist snd_intel8x0m
blacklist snd_aw2
blacklist i2c_i801
blacklist prism54
blacklist bcm43xx
blacklist garmin_gps
blacklist asus_acpi
blacklist snd_pcsp
blacklist pcspkr
blacklist amd76x_edac
[/etc/modprobe.d/blacklist-rare-network.conf]
alias net-pf-3 off
alias net-pf-6 off
alias net-pf-9 off
alias net-pf-11 off
alias net-pf-12 off
alias net-pf-19 off
alias net-pf-21 off
alias net-pf-36 off
[/etc/modprobe.d/intel-microcode-blacklist.conf]
blacklist microcode
[/etc/modprobe.d/iwlwifi.conf]
remove iwlwifi \
(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) \
&& /sbin/modprobe -r mac80211
[/etc/modprobe.d/mlx4.conf]
softdep mlx4_core post: mlx4_en
##### rc.local ##########################
exit 0
##### pm-utils ##########################
##### udev rules ########################
##### dmesg #############################
########## wireless info END ############
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答案1
您的问题是您为无线安装了错误的驱动程序。在可靠的互联网连接下，打开终端并执行以下操作：
sudo apt-get purge bcmwl-kernel-source
sudo apt-get install firmware-b43-installer
重启。