周五我正常使用电脑，但周六（昨天）开机时，图标托盘中没有 WiFi 图标，现在没有网络连接。我想我在周五关机前安装了一些更新。
我已经搜索了几个小时的解决方案。我尝试过降级 libnl 软件包（没有成功；出现很多错误）、验证 /etc/network/interfaces 是否“应该”、使用“sudo ifconfig eth0 up”和“sudo ifconfig wlan0 up”、终止并重新启动 network-manager，以及其他一些操作。
以下是 wireless-info 脚本的输出：
########## wireless info START ##########
Report from: 15 May 2016 07:55 EDT -0400
Booted last: 15 May 2016 07:07 EDT -0400
Script from: 27 Sep 2015 00:34 UTC +0000
##### release ###########################
Distributor ID: Ubuntu
Description: Ubuntu 14.04.4 LTS
Release: 14.04
Codename: trusty
##### kernel ############################
Linux 3.19.0-59-generic #65~14.04.1-Ubuntu SMP Tue Apr 19 18:57:09 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
Parameters: ro, quiet, splash
##### desktop ###########################
Xubuntu
##### lspci #############################
00:19.0 Ethernet controller [0200]: Intel Corporation Ethernet Connection (2) I218-V [8086:15a1]
Subsystem: ASUSTeK Computer Inc. Device [1043:85c4]
Kernel driver in use: e1000e
05:00.0 Network controller [0280]: Broadcom Corporation BCM4352 802.11ac Wireless Network Adapter [14e4:43b1] (rev 03)
Subsystem: ASUSTeK Computer Inc. Device [1043:855c]
Kernel driver in use: wl
##### lsusb #############################
Bus 006 Device 002: ID 8087:8001 Intel Corp.
Bus 006 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 002: ID 8087:8009 Intel Corp.
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 008: ID 13fe:3d00 Kingston Technology Company Inc.
Bus 001 Device 002: ID 1038:1384 SteelSeries ApS
Bus 001 Device 005: ID 0b05:17cf ASUSTek Computer, Inc.
Bus 001 Device 006: ID 0665:6000 Cypress Semiconductor
Bus 001 Device 004: ID 05e3:0608 Genesys Logic, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
##### PCMCIA card info ##################
##### rfkill ############################
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
2: brcmwl-0: Wireless LAN
Soft blocked: no
Hard blocked: no
##### lsmod #############################
wl 6369280 0
eeepc_wmi 16384 0
asus_wmi 24576 1 eeepc_wmi
sparse_keymap 16384 1 asus_wmi
mxm_wmi 16384 0
cfg80211 532480 1 wl
wmi 20480 2 mxm_wmi,asus_wmi
video 20480 1 asus_wmi
##### interfaces ########################
auto lo
iface lo inet loopback
##### ifconfig ##########################
eth0 Link encap:Ethernet HWaddr <MAC 'eth0' [IF]>
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:20 Memory:df800000-df820000
wlan0 Link encap:Ethernet HWaddr <MAC 'wlan0' [IF]>
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:16
##### iwconfig ##########################
eth0 no wireless extensions.
lo no wireless extensions.
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
##### route #############################
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
##### resolv.conf #######################
##### network managers ##################
Installed:
NetworkManager
Running:
None found.
##### NetworkManager info ###############
** (process:2982): WARNING **: Could not initialize NMClient /org/freedesktop/NetworkManager: The name org.freedesktop.NetworkManager was not provided by any .service files
** (process:2982): WARNING **: error: could not connect to NetworkManager
NetworkManager Tool
State: unknown
##### NetworkManager.state ##############
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true
##### NetworkManager.conf ###############
[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq
[ifupdown]
managed=false
##### NetworkManager profiles ###########
[[/etc/NetworkManager/system-connections/NSA5]] (600 root)
[connection] id=NSA5 | type=802-11-wireless
[802-11-wireless] ssid=NSA5 | mac-address=<MAC 'wlan0' [IF]>
[ipv4] method=auto
[ipv6] method=auto
##### iw reg get ########################
Region: America (based on set time zone)
country 00:
(2402 - 2472 @ 40), (3, 20)
(2457 - 2482 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
(2474 - 2494 @ 20), (3, 20), NO-OFDM, PASSIVE-SCAN, NO-IBSS
(5170 - 5250 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
(5735 - 5835 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
##### iwlist channels ###################
eth0 no frequency information.
lo no frequency information.
wlan0 26 channels in total; available frequencies :
Channel 01 : 2.412 GHz
Channel 02 : 2.417 GHz
Channel 03 : 2.422 GHz
Channel 04 : 2.427 GHz
Channel 05 : 2.432 GHz
Channel 06 : 2.437 GHz
Channel 07 : 2.442 GHz
Channel 08 : 2.447 GHz
Channel 09 : 2.452 GHz
Channel 10 : 2.457 GHz
Channel 11 : 2.462 GHz
Channel 12 : 2.467 GHz
Channel 13 : 2.472 GHz
Channel 14 : 2.484 GHz
Channel 36 : 5.18 GHz
Channel 38 : 5.19 GHz
Channel 40 : 5.2 GHz
Channel 42 : 5.21 GHz
Channel 44 : 5.22 GHz
Channel 46 : 5.23 GHz
Channel 48 : 5.24 GHz
Channel 149 : 5.745 GHz
Channel 153 : 5.765 GHz
Channel 157 : 5.785 GHz
Channel 161 : 5.805 GHz
Channel 165 : 5.825 GHz
##### iwlist scan #######################
eth0 Interface doesn't support scanning.
wlan0 Interface doesn't support scanning : Network is down
lo Interface doesn't support scanning.
##### module infos ######################
[wl]
filename: /lib/modules/3.19.0-59-generic/updates/dkms/wl.ko
license: MIXED/Proprietary
srcversion: 3F8570547EE3A2BA3D5D734
depends: cfg80211
vermagic: 3.19.0-59-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/3.19.0-59-generic/kernel/net/wireless/cfg80211.ko
description: wireless configuration support
license: GPL
author: Johannes Berg
srcversion: 46EBD6732E992614FD7F01B
depends:
intree: Y
vermagic: 3.19.0-59-generic SMP mod_unload modversions
signer: Magrathea: Glacier signing key
sig_key: 3B:80:88:D8:E6:B9:3E:AD:6E:77:B0:3C:9C:4E:5C:BA:FB:1A:0B:20
sig_hashalgo: sha512
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 ######################
lp
rtc
##### 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/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 ########################
[/etc/udev/rules.d/70-persistent-net.rules]
# PCI device 0x8086:0x15a1 (e1000e)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC 'eth0' [IF]>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
# PCI device 0x14e4:0x43b1 (wl)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC 'wlan0' [IF]>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"
##### dmesg #############################
[ 3.764190] init: network-manager main process (1080) killed by SEGV signal
[ 3.764194] init: network-manager main process ended, respawning
[ 3.768649] init: network-manager main process (1084) killed by SEGV signal
[ 3.768653] init: network-manager main process ended, respawning
[ 3.773436] init: network-manager main process (1088) killed by SEGV signal
[ 3.773442] init: network-manager main process ended, respawning
[ 3.777916] init: network-manager main process (1092) killed by SEGV signal
[ 3.777921] init: network-manager main process ended, respawning
[ 3.782390] init: network-manager main process (1096) killed by SEGV signal
[ 3.782395] init: network-manager main process ended, respawning
[ 3.786736] init: network-manager main process (1100) killed by SEGV signal
[ 3.786741] init: network-manager main process ended, respawning
[ 3.791089] init: network-manager main process (1104) killed by SEGV signal
[ 3.791093] init: network-manager main process ended, respawning
[ 3.795645] init: network-manager main process (1108) killed by SEGV signal
[ 3.795649] init: network-manager main process ended, respawning
[ 3.799944] init: network-manager main process (1112) killed by SEGV signal
[ 3.799948] init: network-manager respawning too fast, stopped
[ 370.075724] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 1256.755005] traps: NetworkManager[2628] general protection ip:469fee sp:7fffd0059330 error:0 in NetworkManager[400000+10d000]
[ 1256.824208] init: network-manager main process (2628) killed by SEGV signal
[ 1256.824214] init: network-manager main process ended, respawning
[ 1256.828225] traps: NetworkManager[2633] general protection ip:469fee sp:7ffdfc898530 error:0 in NetworkManager[400000+10d000]
[ 1256.888321] init: network-manager main process (2633) killed by SEGV signal
[ 1256.888327] init: network-manager main process ended, respawning
[ 1256.892194] traps: NetworkManager[2638] general protection ip:469fee sp:7fff8c17c470 error:0 in NetworkManager[400000+10d000]
[ 1256.952027] init: network-manager main process (2638) killed by SEGV signal
[ 1256.952033] init: network-manager main process ended, respawning
[ 1256.956001] traps: NetworkManager[2643] general protection ip:469fee sp:7ffde2787bc0 error:0 in NetworkManager[400000+10d000]
[ 1257.015273] init: network-manager main process (2643) killed by SEGV signal
[ 1257.015280] init: network-manager main process ended, respawning
[ 1257.019507] traps: NetworkManager[2648] general protection ip:469fee sp:7ffdbe70be10 error:0 in NetworkManager[400000+10d000]
[ 1257.080366] init: network-manager main process (2648) killed by SEGV signal
[ 1257.080373] init: network-manager main process ended, respawning
[ 1257.084445] traps: NetworkManager[2653] general protection ip:469fee sp:7ffd66f2c6a0 error:0 in NetworkManager[400000+10d000]
[ 1257.145109] init: network-manager main process (2653) killed by SEGV signal
[ 1257.145115] init: network-manager main process ended, respawning
[ 1257.148948] traps: NetworkManager[2658] general protection ip:469fee sp:7ffd26b6da30 error:0 in NetworkManager[400000+10d000]
[ 1257.209643] init: network-manager main process (2658) killed by SEGV signal
[ 1257.209650] init: network-manager main process ended, respawning
[ 1257.213707] traps: NetworkManager[2663] general protection ip:469fee sp:7ffce1201280 error:0 in NetworkManager[400000+10d000]
[ 1257.273139] init: network-manager main process (2663) killed by SEGV signal
[ 1257.273146] init: network-manager main process ended, respawning
[ 1257.277199] traps: NetworkManager[2668] general protection ip:469fee sp:7ffdd51fe290 error:0 in NetworkManager[400000+10d000]
[ 1257.337713] init: network-manager main process (2668) killed by SEGV signal
[ 1257.337720] init: network-manager main process ended, respawning
[ 1257.341554] traps: NetworkManager[2673] general protection ip:469fee sp:7fff9af2b6e0 error:0 in NetworkManager[400000+10d000]
[ 1257.400840] init: network-manager main process (2673) killed by SEGV signal
[ 1257.400846] init: network-manager main process ended, respawning
[ 1257.463779] init: network-manager main process (2678) killed by SEGV signal
[ 1257.463786] init: network-manager respawning too fast, stopped
[ 2940.611218] ERROR @wl_dev_intvar_get : error (-1)
########## wireless info END ############
另一个诊断信息：
me@desktop:~$ sudo lshw -C network
*-network
description: Ethernet interface
product: Ethernet Connection (2) I218-V
vendor: Intel Corporation
physical id: 19
bus info: pci@0000:00:19.0
logical name: eth0
version: 00
serial: 08:62:66:26:dd:43
capacity: 1Gbit/s
width: 32 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=2.3.2-k firmware=0.1-4 latency=0 link=no multicast=yes port=twisted pair
resources: irq:41 memory:df800000-df81ffff memory:df838000-df838fff ioport:f040(size=32)
*-network DISABLED
description: Wireless interface
product: BCM4352 802.11ac Wireless Network Adapter
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:05:00.0
logical name: wlan0
version: 03
serial: 40:e2:30:98:75:73
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:16 memory:df400000-df407fff memory:df200000-df3fffff
其他：
me@desktop:~$ lspci -knn | grep Net -A2
05:00.0 Network controller [0280]: Broadcom Corporation BCM4352 802.11ac Wireless Network Adapter [14e4:43b1] (rev 03)
Subsystem: ASUSTeK Computer Inc. Device [1043:855c]
Kernel driver in use: wl
最后一个：
me@desktop:~$ sudo nm-applet
** (nm-applet:2690): WARNING **: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-ctmYfT0Ijd: Connection refused
(nm-applet:2690): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:2769:41: Expected a valid selector
** (nm-applet:2690): WARNING **: Could not initialize NMClient /org/freedesktop/NetworkManager: The name org.freedesktop.NetworkManager was not provided by any .service files
(nm-applet:2690): nm-applet-WARNING **: Error connecting to ModemManager: Error calling StartServiceByName for org.freedesktop.ModemManager1: GDBus.Error:org.freedesktop.DBus.Error.Spawn.ExecFailed: Cannot launch daemon, file not found or permissions invalid
(nm-applet:2690): nm-applet-WARNING **: Failed to register as an agent: (2) The name org.freedesktop.NetworkManager was not provided by any .service files
nm-applet-Message: using fallback from indicator to GtkStatusIcon
^C
nm-applet-Message: PID 0 (we are 2690) sent signal 2, shutting down...
g_dbus_connection_real_closed: Remote peer vanished with error: Underlying GIOStream returned 0 bytes on an async read (g-io-error-quark, 0). Exiting.
nm-applet-Message: PID 2690 (we are 2690) sent signal 15, shutting down...
** (nm-applet:2690): CRITICAL **: nm_secret_agent_unregister: assertion 'priv->registered == TRUE' failed
请让我知道还有哪些信息可能有助于解决我的问题。
谢谢！
解决这里：http://ubuntuforums.org/showthread.php?t=2324639&p=13489595