我是 ubuntu 新手，想深入了解这个新操作系统，感受一下 Linux。我在 Lenovo Ideapad Yoga 11s 上安装了 Ubuntu 14.04，并安装了谷歌浏览器和系统更新。安装完成后，我无法再访问互联网。设置中没有显示 wifi 图标，也没有显示网络。不需要安装其他驱动程序。
$ rfkill list all
0: ideapad_wlan: Wireless LAN
Soft blocked: no
hard blocked: no
1: ideapad_bluetooth: Bluetooth
soft blocked: yes
hard blocked: no
$ lspci -nn | grep 0280
# no results
我还运行了无线脚本此处的选项 2
########## wireless info START ##########
Report from: 13 Feb 2015 19:55 EST -0500
Booted last: 13 Feb 2015 19:52 EST -0500
Script from: 20 Sep 2014 23:04 UTC +0000
##### release ###########################
Distributor ID: Ubuntu
Description: Ubuntu 14.04.1 LTS
Release: 14.04
Codename: trusty
##### kernel ############################
Linux 3.13.0-45-generic #74-Ubuntu SMP Tue Jan 13 19:36:28 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Parameters: ro, quiet, splash, vt.handoff=7
##### desktop ###########################
Ubuntu
##### lspci #############################
##### lsusb #############################
Bus 002 Device 005: ID 04f2:b35e Chicony Electronics Co., Ltd
Bus 002 Device 004: ID 0bda:1724 Realtek Semiconductor Corp.
Bus 002 Device 003: ID 2047:0855 Texas Instruments
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 004: ID 03eb:8814 Atmel Corp.
Bus 001 Device 003: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 002: ID 1b1c:1a03 Corsair
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
##### PCMCIA card info ##################
##### rfkill ############################
0: ideapad_wlan: Wireless LAN
Soft blocked: no
Hard blocked: no
1: ideapad_bluetooth: Bluetooth
Soft blocked: yes
Hard blocked: no
##### lsmod #############################
ideapad_laptop 18216 0
sparse_keymap 13948 1 ideapad_laptop
wmi 19177 0
##### interfaces ########################
auto lo
iface lo inet loopback
##### ifconfig ##########################
##### iwconfig ##########################
lo no wireless extensions.
##### route #############################
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
##### resolv.conf #######################
##### nm-tool ###########################
NetworkManager Tool
State: disconnected
##### NetworkManager.state ##############
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true
##### NetworkManager.conf ###############
[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq
[ifupdown]
managed=true
##### NetworkManager profiles ###########
[[/etc/NetworkManager/system-connections/dragonfly3]] (600 root)
[ipv6] method=auto
[connection] id=dragonfly3 | type=802-11-wireless
[802-11-wireless] ssid=dragonfly3 | mac-address=<MAC address>
[802-1x] system-ca-certs=true
[ipv4] method=auto
[[/etc/NetworkManager/system-connections/TiggleBittyNP]] (600 root)
[connection] id=TiggleBittyNP | type=802-11-wireless
[802-11-wireless] ssid=TiggleBittyNP | mac-address=<MAC address>
[ipv4] method=auto
[ipv6] method=auto
##### iw reg get ########################
Region: America/New_York (based on set time zone)
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 ###################
lo no frequency information.
##### iwlist scan #######################
lo Interface doesn't support scanning.
##### module infos ######################
##### module parameters #################
##### /etc/modules ######################
lp
rtc
##### modprobe options ##################
[/etc/modprobe.d/blacklist-ath_pci.conf]
blacklist ath_pci
[/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 ##########################
[/etc/pm/sleep.d/wakenet.sh] (755 root)
case "$1" in
thaw|resume)
nmcli nm sleep false
##### udev rules ########################
[/etc/udev/rules.d/70-persistent-net.rules]
# USB device 0x:0x (rtl8723au)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC address>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"
##### dmesg #############################
########## wireless info END ############
答案1
您的设备ID 0bda:1724 Realtek Semiconductor Corp.由驱动程序 8723au 驱动。它至少在 3.13.0-xx 内核版本中并不原生存在于 Ubuntu 14.04 中。但是，它显然已经编译过并且之前曾在这里使用过，因为我们看到您已连接到的网络：例如 [/etc/NetworkManager/system-connections/dragonfly3]。此外，我们还看到一条 udev 规则：
USB device 0x:0x (rtl8723au)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?", ATTR{address}=="",ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan", NAME="wlan0"
如果您从源代码编译了驱动程序，则在安装更高版本的内核时需要重新编译，例如，当 3.13.0-44 更新为 xx-45 时。在终端中：
cd ~/Downloads/rtl8723au <---or wherever the downloaded source file is located
make clean
make
sudo make install
sudo modprobe 8723au
每当更新管理器安装了更高版本的内核时，就重复此序列。