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this morning I installed some of the updates for Ubuntu 12.10 and my wifi has disappeared.

This is the output for rfkill list all

0: hci0: Bluetooth
    Soft blocked: yes
    Hard blocked: no

You can see that there is nto even an option for wireless. I also tried:

sudo lshw -c network

[sudo] password for usuario: 
  *-network NO RECLAMADO  
       descripción: Network controller
       producto: Realtek Semiconductor Co., Ltd.
       fabricante: Realtek Semiconductor Co., Ltd.
       id físico: 0
       información del bus: pci@0000:02:00.0
       versión: 00
       anchura: 64 bits
       reloj: 33MHz
       capacidades: pm msi pciexpress bus_master cap_list
       configuración: latency=0
       recursos: ioport:e000(size=256) memoria:f7d00000-f7d03fff
  *-network
       descripción: Ethernet interface
       producto: RTL8101E/RTL8102E PCI Express Fast Ethernet controller
       fabricante: Realtek Semiconductor Co., Ltd.
       id físico: 0.2
       información del bus: pci@0000:03:00.2
       nombre lógico: eth0
       versión: 06
       serie: 00:90:f5:e2:f7:05
       tamaño: 100Mbit/s
       capacidad: 100Mbit/s
       anchura: 64 bits
       reloj: 33MHz
       capacidades: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuración: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8402-1_0.0.1 10/26/11 ip=192.168.1.38 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
       recursos: irq:41 ioport:d000(size=256) memoria:f0004000-f0004fff memoria:f0000000-f0003fff

The laptop is an Airis praxis n1204 32 bits.

Any help would be greatly apprecaited as I've been trying to fix it since 9 am Thanks for the replies so far. I have tried the two solutions suggested below, but unfortunately the problem persists. This is the output from lspci:

00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller (rev 09) 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) 00:16.0 Communication controller: Intel Corporation 7 Series/C210 Series Chipset Family MEI Controller #1 (rev 04) 00:1a.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2 (rev 04) 00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller (rev 04) 00:1c.0 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 1 (rev c4) 00:1c.2 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 3 (rev c4) 00:1c.3 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 4 (rev c4) 00:1d.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1 (rev 04) 00:1f.0 ISA bridge: Intel Corporation 7 Series Chipset Family LPC Controller (rev 04) 00:1f.2 SATA controller: Intel Corporation 7 Series Chipset Family 6-port SATA Controller [AHCI mode] (rev 04) 00:1f.3 SMBus: Intel Corporation 7 Series/C210 Series Chipset Family SMBus Controller (rev 04) 02:00.0 Network controller: Realtek Semiconductor Co., Ltd. Device 8723 03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. Device 5286 (rev 01) 03:00.2 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 06)

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include lspci also. If you have installed driver manually (not from addtional driver tab of software center) you need to do it again –  Web-E May 11 '13 at 17:23

2 Answers 2

You can follow this thread --> http://ubuntuforums.org/showthread.php?t=1997880

It worked for me/13.04.

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I had the same problem on my laptop. I have run these commands and afther that it worked: sudo apt-get install linux-headers-generic sudo apt-get install --reinstall bcmwl-kernel-source sudo modprobe wl

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