no wireless extensions

Can you please provide the output of:

sudo lshw -C network

Hello,

thanks for your interest, funny enough I can use wired internet at my friends house, but the wireless is not working in any place.
Nevertheless below is the reply for your query:

stephenbrincat@ubuntu:~$ sudo lshw -C network
[sudo] password for stephenbrincat:
  *-network
       description: Network controller
       product: BCM4312 802.11b/g
       vendor: Broadcom Corporation
       physical id: 0
       bus info: pci@0000:06:00.0
       version: 01
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list
       configuration: driver=b43-pci-bridge latency=0
       resources: irq:19 memory:f4000000-f4003fff
  *-network
       description: Ethernet interface
       product: RTL8111/8168B PCI Express Gigabit Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:07:00.0
       logical name: eth0
       version: 02
       serial: 00:21:70:92:3b:36
       size: 100MB/s
       capacity: 1GB/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full ip=192.168.1.32 latency=0 link=yes multicast=yes port=MII speed=100MB/s
       resources: irq:29 ioport:5000(size=256) memory:f8610000-f8610fff(prefetchable) memory:f8600000-f860ffff(prefetchable) memory:f8620000-f862ffff(prefetchable)

Hi,

Please first connect your network card to the wireless router using an ethernet cable (also known as a LAN cable).

In order to gather essential troubleshooting information about your wireless card, please follow this procedure:

Step 1: Open Terminal from "Applications->Accessories->Terminal"

Step 2: Please copy-paste the following command from the https://answers.launchpad.net/ubuntu website in Firefox into the Linux Terminal. Do NOT copy-paste from the Email message into the Terminal, as that will only copy PART of the command. The command STARTS with the word sudo and ENDS with the word restart. So please copy-paste the ENTIRE command below from Firefox into a Terminal, press <enter>, then enter password when sudo asks for password, then press enter again.

sudo lshw -C network; sudo iwlist scanning; cat /etc/network/interfaces; cat /etc/lsb-release; lspci -nn; lsusb; sudo lshw -C usb; uname -a; dmesg | grep ound; dmesg | grep b43; dmesg | grep iwl; iwconfig; sudo /etc/init.d/networking restart

Step 3: Please post results (copy/paste terminal output) on this thread

Regards,

Mark

Thanks actionparsnip, that solved my question.