尽管存在 wifi 连接，但我的 wifi 并未检测到任何 wifi 连接。
我一启动系统就会出现网络断开通知。但它有时会正常工作，而且很奇怪。
并且，在 wifi 选项中没有启用 wifi 的选项，就像启用网络一样。
其他人也报告了类似的问题： 戴尔 Inspiron 5420 列表中的 ubuntu 14.04 中突然停止显示我的 wifi？
我已经进行了诊断我的无线/WiFi 连接无法使用。诊断问题需要哪些信息？
以下是报告全文：
########## wireless info START ##########
Report from: 26 Aug 2014 12:37 IST +0530
Script from: 17 Aug 2014 02:46 UTC +0000
##### release #####
Distributor ID: Ubuntu
Description: Ubuntu 14.04.1 LTS
Release: 14.04
Codename: trusty
##### kernel #####
Linux 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
Parameters: ro, quiet, splash, vt.handoff=7
##### desktop #####
Ubuntu
##### lspci #####
00:19.0 Ethernet controller [0200]: Intel Corporation Ethernet Connection I218-LM [8086:155a] (rev 04)
Subsystem: Dell Device [1028:05de]
Kernel driver in use: e1000e
##### lsusb #####
Bus 001 Device 004: ID 8087:07dc Intel Corp.
Bus 001 Device 003: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub
Bus 001 Device 002: ID 8087:8000 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 002: ID 0461:4d51 Primax Electronics, Ltd 0Y357C PMX-MMOCZUL (B) [Dell Laser Mouse]
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
##### PCMCIA card info #####
##### rfkill #####
0: dell-bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
1: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
##### lsmod #####
dell_wmi 12761 0
sparse_keymap 13948 1 dell_wmi
wmi 19177 1 dell_wmi
##### interfaces #####
auto lo
iface lo inet loopback
##### ifconfig #####
eth0 Link encap:Ethernet HWaddr <MAC addr eth0>
inet addr:10.0.0.53 Bcast:10.0.0.255 Mask:255.255.255.0
inet6 addr: fe80::eef4:bbff:fe19:f33c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:328153 errors:0 dropped:0 overruns:0 frame:0
TX packets:188224 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:30083070 (30.0 MB) TX bytes:14284753 (14.2 MB)
Interrupt:20 Memory:f7f00000-f7f20000
##### iwconfig #####
eth0 no wireless extensions.
lo no wireless extensions.
##### route #####
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.0.0.1 0.0.0.0 UG 0 0 0 eth0
10.0.0.0 0.0.0.0 255.255.255.0 U 1 0 0 eth0
##### resolv.conf #####
nameserver 127.0.1.1
search web2labs.com
##### nm-tool #####
NetworkManager Tool
State: connected (global)
- Device: eth0 [Ethernet connection 1] ----------------------------------------
Type: Wired
Driver: e1000e
State: connected
Default: yes
HW Address: <MAC addr eth0>
Capabilities:
Carrier Detect: yes
Speed: 1000 Mb/s
Wired Properties
Carrier: on
IPv4 Settings:
Address: 10.0.0.53
Prefix: 24 (255.255.255.0)
Gateway: 10.0.0.1
DNS: 10.0.0.1
##### NetworkManager.state #####
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true
##### NetworkManager.conf #####
[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq
[ifupdown]
managed=false
##### iw reg get #####
country 00:
(2402 - 2472 @ 40), (6, 20)
(2457 - 2482 @ 40), (6, 20), PASSIVE-SCAN, NO-IBSS
(2474 - 2494 @ 20), (6, 20), NO-OFDM, PASSIVE-SCAN, NO-IBSS
(5170 - 5250 @ 160), (6, 20), PASSIVE-SCAN, NO-IBSS
(5250 - 5330 @ 160), (6, 20), DFS, PASSIVE-SCAN, NO-IBSS
(5490 - 5730 @ 160), (6, 20), DFS, PASSIVE-SCAN, NO-IBSS
##### iwlist channels #####
eth0 no frequency information.
lo no frequency information.
##### iwlist scan #####
eth0 Interface doesn't support scanning.
lo Interface doesn't support scanning.
##### module infos #####
##### module parameters #####
##### /etc/modules #####
lp
rtc
acpiphp
##### blacklists #####
[/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-i915-hsw.conf]
blacklist i915_hsw
##### udev rules #####
[/etc/udev/rules.d/70-persistent-net.rules]
# PCI device 0x8086:0x155a (e1000e)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC addr eth0>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
# PCI device 0x8086:0x08b1 (iwlwifi)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC address>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"
# USB device 0x:0x (cdc_ether)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC address>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"
##### dmesg #####
[ 1.299759] e1000e: Intel(R) PRO/1000 Network Driver - 2.3.2-k
[ 1.463135] e1000e 0000:00:19.0 eth0: Intel(R) PRO/1000 Network Connection
[ 18.312061] Bluetooth: hci0: Intel Bluetooth firmware file: intel/ibt-hw-37.7.10-fw-1.80.2.3.d.bseq
[ 18.434935] Bluetooth: hci0: Intel Bluetooth firmware patch completed and activated
########## wireless info END ############
答案1
网络上的所有用户都在不断地连接和断开连接，或者没有检测到你的 wifi 驱动程序？
您说它之前已连接。因此，请检查您在系统中添加了哪些新内容。我遇到了 wifi 持续获取问题，因为 WIFI 频率与其他 wifi 路由器冲突。通过在路由器中设置“选择自动频道”模式解决了此问题。
还要转到软件和更新，并检查设置，这也会导致 wifi 驱动程序的问题。
问候，Santosh