Connexion WIFI XUBUNTU

Bonsoir,
Je viens d'installer Xubuntu 13.04 en dual boot avec XP, mais je sais pas comment établir la connexion à un réseau sans fil ; j'ai suivi une procédure trouvée sur ce site mais ne sais pas aller plus loin :

laurent@Laurent:~$ lspci
00:00.0 Host bridge: VIA Technologies, Inc. VT8378 [KM400/A] Chipset Host Bridge
00:01.0 PCI bridge: VIA Technologies, Inc. VT8237/VX700 PCI Bridge
00:05.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
00:10.0 USB controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 80)
00:10.1 USB controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 80)
00:10.2 USB controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 80)
00:10.3 USB controller: VIA Technologies, Inc. USB 2.0 (rev 82)
00:11.0 ISA bridge: VIA Technologies, Inc. VT8235 ISA Bridge
00:11.1 IDE interface: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06)
00:11.5 Multimedia audio controller: VIA Technologies, Inc. VT8233/A/8235/8237 AC97 Audio Controller (rev 50)
00:12.0 Ethernet controller: VIA Technologies, Inc. VT6102 [Rhine-II] (rev 74)
01:00.0 VGA compatible controller: NVIDIA Corporation NV34 [GeForce FX 5200LE] (rev a1)
laurent@Laurent:~$ lsusb
Bus 001 Device 006: ID 0457:0163 Silicon Integrated Systems Corp. 802.11 Wireless LAN Adapter
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 002: ID 116f:c108 Silicon 10 Technology Corp. Flash Card Reader
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
laurent@Laurent:~$ /sbin/iwconfig
lo no wireless extensions.

eth0 no wireless extensions.

eth1 no wireless extensions.

laurent@Laurent:~$

Merci pour votre aide