我最近更新了系统，wifi 不可用。你能帮我修复这个问题吗？
lspci -nn gives this:
00:00.0 Host bridge [0600]: Intel Corporation 2nd Generation Core Processor Family DRAM Controller [8086:0104] (rev 09)
00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09)
00:16.0 Communication controller [0780]: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 [8086:1c3a] (rev 04)
00:19.0 Ethernet controller [0200]: Intel Corporation 82579V Gigabit Network Connection [8086:1503] (rev 04)
00:1a.0 USB controller [0c03]: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 [8086:1c2d] (rev 04)
00:1b.0 Audio device [0403]: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller [8086:1c20] (rev 04)
00:1c.0 PCI bridge [0604]: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 [8086:1c10] (rev b4)
00:1c.2 PCI bridge [0604]: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 3 [8086:1c14] (rev b4)
00:1c.4 PCI bridge [0604]: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 5 [8086:1c18] (rev b4)
00:1d.0 USB controller [0c03]: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 [8086:1c26] (rev 04)
00:1f.0 ISA bridge [0601]: Intel Corporation HM65 Express Chipset Family LPC Controller [8086:1c49] (rev 04)
00:1f.2 SATA controller [0106]: Intel Corporation 6 Series/C200 Series Chipset Family 6 port SATA AHCI Controller [8086:1c03] (rev 04)
01:00.0 System peripheral [0880]: Ricoh Co Ltd PCIe SDXC/MMC Host Controller [1180:e823] (rev 07)
02:00.0 Network controller [0280]: Intel Corporation Centrino Advanced-N 6230 [Rainbow Peak] [8086:0091] (rev 34)
03:00.0 USB controller [0c03]: NEC Corporation uPD720200 USB 3.0 Host Controller [1033:0194] (rev 04)
lshw -C Network
*-network
description: Ethernet interface
produit: 82579V Gigabit Network Connection
fabriquant: Intel Corporation
identifiant matériel: 19
information bus: pci@0000:00:19.0
nom logique: eth0
version: 04
numéro de série: e8:e0:b7:5a:d4:50
taille: 1Gbit/s
capacité: 1Gbit/s
bits: 32 bits
horloge: 33MHz
fonctionnalités: 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 duplex=full firmware=0.13-4 ip=192.168.0.16 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
ressources: irq:46 mémoire:c0700000-c071ffff mémoire:c072b000-c072bfff portE/S:2080(taille=32)
*-network NON-RÉCLAMÉ
description: Network controller
produit: Centrino Advanced-N 6230 [Rainbow Peak]
fabriquant: Intel Corporation
identifiant matériel: 0
information bus: pci@0000:02:00.0
version: 34
bits: 64 bits
horloge: 33MHz
fonctionnalités: pm msi pciexpress bus_master cap_list
configuration: latency=0
ressources: mémoire:c0500000-c0501fff谢谢
uname -r; dpkg -l | grep extra
3.13.0-95-generic
ii binfmt-support 2.1.4-1 i386 Support for extra binary formats
ii cabextract 1.4-4 i386 Microsoft Cabinet file unpacker
ii cdparanoia 3.10.2+debian-11 i386 audio extraction tool for sampling CDs
ii chromium-codecs-ffmpeg-extra 52.0.2743.116-0ubuntu0.14.04.1.1134 i386 Extra ffmpeg codecs for the Chromium Browser
ii fonts-dejavu 2.34-1ubuntu1 all metapackage to pull in fonts-dejavu-core and fonts-dejavu-extra
ii fonts-dejavu-extra 2.34-1ubuntu1 all Vera font family derivate with additional characters (extra variants)
ii gnome-themes-extras 2.22.0-3 all extra themes for the GNOME desktop
ii icoutils 0.31.0-2 i386 Create and extract MS Windows icons and cursors
ii libarchive-extract-perl 0.70-1 all generic archive extracting module
rc libavcodec-extra-53:i386 4:0.8.12ubuntu0.12.04.1 i386 Libav codec library
ii libavcodec-extra-54:i386 6:9.18-0ubuntu0.14.04.1 i386 Libav codec library (additional codecs)
rc libavutil-extra-51:i386 4:0.8.12ubuntu0.12.04.1 i386 Libav utility library
ii libcdparanoia0:i386 3.10.2+debian-11 i386 audio extraction tool for sampling CDs (library)
ii libgnomevfs2-extra:i386 1:2.24.4-1ubuntu6 i386 GNOME Virtual File System (extra modules)
ii libgnuinet-java 1.1.2-2build1 all extension library to provide extra network protocol support
ii libhtml-tableextract-perl 2.11-1 all module for extracting the content contained in HTML tables
ii libido-0.1-0:i386 12.10.0.1-0ubuntu2 i386 Shared library providing extra gtk menu items for display in
ii libido3-0.1-0:i386 13.10.0+14.04.20151021-0ubuntu1 i386 Shared library providing extra gtk menu items for display in
ii libmagickcore5-extra:i386 8:6.7.7.10-6ubuntu3.1 i386 low-level image manipulation library - extra codecs
ii liborbit2:i386 1:2.14.19-0.3 i386 high-performance CORBA implementation - extra libraries
ii libpurple-bin 1:2.10.9-0ubuntu3.3 all multi-protocol instant messaging library - extra utilities
ii librsvg2-common:i386 2.40.2-1 i386 SAX-based renderer library for SVG files (extra runtime)
ii libvcdinfo0 0.7.24+dfsg-0.1ubuntu2 i386 library to extract information from VideoCD
rc linux-image-extra-3.13.0-37-generic 3.13.0-37.64 i386 Linux kernel extra modules for version 3.13.0 on 32 bit x86 SMP
ii linux-image-extra-3.13.0-39-generic 3.13.0-39.66 i386 Linux kernel extra modules for version 3.13.0 on 32 bit x86 SMP
ii linux-image-extra-3.13.0-40-generic 3.13.0-40.69 i386 Linux kernel extra modules for version 3.13.0 on 32 bit x86 SMP
ii linux-image-extra-3.13.0-43-generic 3.13.0-43.72 i386 Linux kernel extra modules for version 3.13.0 on 32 bit x86 SMP
ii linux-image-extra-3.13.0-45-generic 3.13.0-45.74 i386 Linux kernel extra modules for version 3.13.0 on 32 bit x86 SMP
ii linux-image-extra-3.13.0-46-generic 3.13.0-46.79 i386 Linux kernel extra modules for version 3.13.0 on 32 bit x86 SMP
ii linux-image-extra-3.13.0-48-generic 3.13.0-48.80 i386 Linux kernel extra modules for version 3.13.0 on 32 bit x86 SMP
ii linux-image-extra-3.13.0-58-generic 3.13.0-58.97 i386 Linux kernel extra modules for version 3.13.0 on 32 bit x86 SMP
ii linux-image-extra-3.13.0-63-generic 3.13.0-63.103 i386 Linux kernel extra modules for version 3.13.0 on 32 bit x86 SMP
ii linux-image-extra-3.13.0-65-generic 3.13.0-65.106 i386 Linux kernel extra modules for version 3.13.0 on 32 bit x86 SMP
ii oxideqt-codecs-extra:i386 1.9.5-0ubuntu0.14.04.1 i386 Web browser engine library for Qt (codecs)
ii qtdeclarative5-ubuntu-ui-extras-browser-plugin:i386 0.23+14.04.20140428-0ubuntu1 i386 Ubuntu web browser QML plugin
ii qtdeclarative5-ubuntu-ui-extras-browser-plugin-assets 0.23+14.04.20140428-0ubuntu1 all Ubuntu web browser QML plugin assets
ii ttf-dejavu-extra 2.34-1ubuntu1 all transitional dummy package
ii ubuntu-extras-keyring 2010.09.27 all GnuPG keys of the Ubuntu extras archive
ii ubuntu-restricted-extras 60.1 i386 Commonly used restricted packages for Ubuntu答案1
我遇到了类似的问题。但我按照这些简单的说明操作后，问题就解决了。按照这个如何使 Realtek RTL8723BE 无线网卡工作？
但要小心..！！