Problème de configuration wifi sous ubuntu

Bonjour,
voila comme dis dans le titre du message j'ai un problème de configuration de ma carte wifi sous ubuntu même à l'aide du tuto: http://www.commentcamarche.net/faq/sujet 11210 configurer le wifi sous linux#troisieme etape configurer la carte

donc voici mes configurations:

carte wifi: Wireless 802.11n+BT
distribution: Ubuntu (la dernière version)
je souhaite me connectée une livebox
résultat des commandes:

/sbin/iwconfig:

lo no wireless extensions.

eth0 no wireless extensions.

wmaster0 no wireless extensions.

wlan0 IEEE 802.11bgn ESSID:""
Mode:Managed Frequency:2.412 GHz Access Point: Not-Associated
Bit Rate:1 Mb/s Tx-Power=27 dBm
Retry min limit:7 RTS thr:off Fragment thr=2352 B
Power Management:off
Link Quality=93/100 Signal level:-35 dBm Noise level=-95 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

pan0 no wireless extensions.


/sbin/ifconfig:


claire@claire-laptop:/$ /sbin/ifconfig
eth0 Link encap:Ethernet HWaddr 00:23:54:8a:40:be
inet adr:192.168.1.72 Bcast:192.168.1.255 Masque:255.255.255.0
adr inet6: fe80::223:54ff:fe8a:40be/64 Scope:Lien
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Packets reçus:243852 erreurs:0 :0 overruns:0 frame:0
TX packets:146896 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:1000
Octets reçus:357163772 (357.1 MB) Octets transmis:11805114 (11.8 MB)
Interruption:19 Adresse de base:0xdead

lo Link encap:Boucle locale
inet adr:127.0.0.1 Masque:255.0.0.0
adr inet6: ::1/128 Scope:Hôte
UP LOOPBACK RUNNING MTU:16436 Metric:1
Packets reçus:0 erreurs:0 :0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:0
Octets reçus:0 (0.0 B) Octets transmis:0 (0.0 B)

wlan0 Link encap:Ethernet HWaddr 00:22:43:4c:b2:59
adr inet6: fe80::222:43ff:fe4c:b259/64 Scope:Lien
UP BROADCAST MULTICAST MTU:1500 Metric:1
Packets reçus:184 erreurs:0 :0 overruns:0 frame:0
TX packets:176 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:1000
Octets reçus:20792 (20.7 KB) Octets transmis:27345 (27.3 KB)

wlan0:avahi Link encap:Ethernet HWaddr 00:22:43:4c:b2:59
inet adr:169.254.6.18 Bcast:169.254.255.255 Masque:255.255.0.0
UP BROADCAST MULTICAST MTU:1500 Metric:1

wmaster0 Link encap:UNSPEC HWaddr 00-22-43-4C-B2-59-00-00-00-00-00-00-00-00-00-00
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Packets reçus:0 erreurs:0 :0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:1000
Octets reçus:0 (0.0 B) Octets transmis:0 (0.0 B)

/sbin/route -n :

claire@claire-laptop:/$ /sbin/route -n
Table de routage IP du noyau
Destination Passerelle Genmask Indic Metric Ref Use Iface
192.168.1.0 0.0.0.0 255.255.255.0 U 1 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 wlan0
169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0
0.0.0.0 0.0.0.0 0.0.0.0 U 1000 0 0 wlan0


cat /etc/resolv.conf :

# Generated by NetworkManager
nameserver 192.168.1.1


nslookup www.google.fr
Server: 192.168.1.1
Address: 192.168.1.1#53

Non-authoritative answer:
www.google.fr canonical name = www.google.com.
www.google.com canonical name = www.l.google.com.
Name: www.l.google.com
Address: 64.233.183.99
Name: www.l.google.com
Address: 64.233.183.104
Name: www.l.google.com
Address: 64.233.183.147
Name: www.l.google.com
Address: 64.233.183.103


ping -c2 www.google.fr :


PING www.l.google.com (64.233.183.103) 56(84) bytes of data.
64 bytes from nf-in-f103.google.com (64.233.183.103): icmp_seq=1 ttl=234 time=59.2 ms
64 bytes from nf-in-f103.google.com (64.233.183.103): icmp_seq=2 ttl=234 time=62.1 ms

--- www.l.google.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1005ms
rtt min/avg/max/mdev = 59.270/60.713/62.156/1.443 ms


cat /etc/network/interfaces :


auto lo
iface lo inet loopback
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

cat /etc/wpa_supplicant/wpa_supplicant.conf :

ctrl_interface=/var/run/wpa_supplicant
eapol_version=1
ap_scan=1
fast_reauth=1

network-{
ssid="Livebox-5528"
scan_ssid=1
proto=WPA
key_mgmt=WPA-PSK
psk=4A3B6D59CAA9310FA3A552176D
priority=5
}


voilà j'espère n'avoir rien oublié de vous communiqué.
j'ai donc suivi pas à pas le tutoriel mais lorsque je lance la commande:
sudo ifconfig wlan0 up
sudo dhclient wlan0
voici le résultat que j'obtiens:

There is already a pid file /var/run/dhclient.pid with pid 6755
killed old client process, removed PID file
Internet Systems Consortium DHCP Client V3.1.1
Copyright 2004-2008 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

wmaster0: unknown hardware address type 801
wmaster0: unknown hardware address type 801
Listening on LPF/wlan0/00:22:43:4c:b2:59
Sending on LPF/wlan0/00:22:43:4c:b2:59
Sending on Socket/fallback
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 5
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 6
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 6
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 13
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 20
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 11
No DHCPOFFERS received.
No working leases in persistent database - sleeping.

alors j'ai une question es-ce qu'il faut je je tue le processus dont il me donne le PID et recommencer la manip pour que ça marche? ou ça ne changera rien et j'ai mal suivi les instructions du tutoriel?

Merci de m'aider