我有一台 DELL Inspiron N5010 笔记本电脑，并且有 Windows 8.1 和 Ubuntu 14.04 双启动。我之前使用的是 Ubuntu 13.10，现在我使用实时媒体安装了 14.04（我没有升级）。现在我无法通过 Wi-Fi 访问互联网。它可以毫无问题地连接到 wifi，但就是无法上网。在 Windows 8.1 中，它可以正常工作。
我可以通过 USB 串行调制解调器访问互联网，但不能通过 WiFi 访问。
以下是我能从笔记本电脑收集到的一些信息。
user@laptop:~$ cat /etc/lsb-release; uname -a
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04 LTS"
Linux machine 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:11:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
user@laptop:~$ lspci -nnk | grep -iA2 net
12:00.0 Network controller [0280]: Broadcom Corporation BCM4313 802.11bgn Wireless Network Adapter [14e4:4727] (rev 01)
Subsystem: Dell Inspiron M5010 / XPS 8300 [1028:0010]
Kernel driver in use: wl
13:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller [10ec:8136] (rev 02)
Subsystem: Dell Device [1028:0447]
Kernel driver in use: r8169
user@laptop:~$ iwconfig
eth0 no wireless extensions.
lo no wireless extensions.
wlan0 IEEE 802.11abg ESSID:off/any
Mode:Managed Access Point: Not-Associated
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
user@laptop:~$ iwconfig
ppp0 no wireless extensions.
eth0 no wireless extensions.
lo no wireless extensions.
wlan0 IEEE 802.11abg ESSID:off/any
Mode:Managed Access Point: Not-Associated
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
user@laptop:~$ rfkill list all
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
1: brcmwl-0: Wireless LAN
Soft blocked: no
Hard blocked: no
2: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
user@laptop:~$ lsmod
Module Size Used by
ppp_deflate 12950 0
bsd_comp 12921 0
ppp_async 17413 1
crc_ccitt 12707 1 ppp_async
option 42468 3
usb_wwan 20429 1 option
usbserial 45014 9 option,usb_wwan
usb_storage 62209 0
bnep 19624 2
rfcomm 69160 8
joydev 17381 0
snd_hda_codec_hdmi 46207 1
snd_hda_codec_idt 54645 1
btusb 32412 0
bluetooth 395423 22 bnep,btusb,rfcomm
hid_generic 12548 0
usbhid 52616 0
hid 106148 2 hid_generic,usbhid
uvcvideo 80885 0
videobuf2_vmalloc 13216 1 uvcvideo
videobuf2_memops 13362 1 videobuf2_vmalloc
videobuf2_core 40664 1 uvcvideo
videodev 134688 2 uvcvideo,videobuf2_core
dell_wmi 12761 0
sparse_keymap 13948 1 dell_wmi
snd_hda_intel 52355 3
snd_hda_codec 192906 3 snd_hda_codec_hdmi,snd_hda_codec_idt,snd_hda_intel
snd_hwdep 13602 1 snd_hda_codec
snd_pcm 102099 3 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel
snd_page_alloc 18710 2 snd_pcm,snd_hda_intel
snd_seq_midi 13324 0
snd_seq_midi_event 14899 1 snd_seq_midi
dell_laptop 18168 0
dcdbas 14928 1 dell_laptop
snd_rawmidi 30144 1 snd_seq_midi
lib80211_crypt_tkip 17619 0
intel_powerclamp 14705 0
coretemp 13435 0
kvm_intel 143060 0
kvm 451511 1 kvm_intel
snd_seq 61560 2 snd_seq_midi_event,snd_seq_midi
psmouse 102222 0
wl 4207846 0
intel_ips 18664 0
serio_raw 13462 0
i915 783485 8
snd_seq_device 14497 3 snd_seq,snd_rawmidi,snd_seq_midi
lib80211 14381 2 wl,lib80211_crypt_tkip
cfg80211 484040 1 wl
lpc_ich 21080 0
snd_timer 29482 2 snd_pcm,snd_seq
mei_me 18627 0
snd 69238 17 snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_hda_codec_idt,snd_pcm,snd_seq,snd_raw midi,snd_hda_codec,snd_hda_intel,snd_seq_device,snd_seq_midi
mei 82274 1 mei_me
drm_kms_helper 52758 1 i915
soundcore 12680 1 snd
drm 302817 4 i915,drm_kms_helper
i2c_algo_bit 13413 1 i915
wmi 19177 1 dell_wmi
video 19476 1 i915
mac_hid 13205 0
parport_pc 32701 0
ppdev 17671 0
lp 17759 0
parport 42348 3 lp,ppdev,parport_pc
ahci 25819 4
r8169 67581 0
libahci 32168 1 ahci
mii 13934 1 r8169
user@laptop:
谢谢。
答案1
- 您有 IP 地址吗？
ifconfig
- 你能 ping 通你的路由器/网关吗
ping 192.168.1.1（可能不同）
- 您能 ping 通 Google 的 DNS 服务器吗？
ping 8.8.8.8
如果上述步骤成功，则您很可能遇到了 DNS 问题。如果上述任何步骤失败，则应重点关注网络的该部分。