PAS DE CONNCTION WIFI

Bonjour, nouvel utilisateur de linux , je suis équipé d'un dell inspiron 1525 avec la version d'ubuntu gnome 8.10
le probleme c'est que la wifi ne marche pas , le signal est bien detecté mais la connetion ne se fait pas

voici quelques infos sur mon ordi :

julien@dell-desktop:~$ /sbin/iwconfig
lo no wireless extensions.

eth0 no wireless extensions.

wmaster0 no wireless extensions.

wlan0 IEEE 802.11abg ESSID:""
Mode:Managed Frequency:2.422 GHz Access Point: Not-Associated
Tx-Power=15 dBm
Retry min limit:7 RTS thr:off Fragment thr=2352 B
Power Management:off
Link Quality:0 Signal level:0 Noise level:0
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.

julien@dell-desktop:~$ /sbin/ifconfig
eth0 Link encap:Ethernet HWaddr 00:21:9b:e7:a6:32
inet adr:192.168.1.99 Bcast:192.168.1.255 Masque:255.255.255.0
adr inet6: fe80::221:9bff:fee7:a632/64 Scope:Lien
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Packets reçus:1928 erreurs:0 :0 overruns:0 frame:0
TX packets:1706 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:1000
Octets reçus:2079625 (2.0 MB) Octets transmis:233188 (233.1 KB)
Interruption:16

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:22 erreurs:0 :0 overruns:0 frame:0
TX packets:22 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:0
Octets reçus:1312 (1.3 KB) Octets transmis:1312 (1.3 KB)

wlan0 Link encap:Ethernet HWaddr 00:1f:3c:c1:d4:a7
adr inet6: fe80::21f:3cff:fec1:d4a7/64 Scope:Lien
UP BROADCAST MULTICAST MTU:1500 Metric:1
Packets reçus:19 erreurs:0 :0 overruns:0 frame:0
TX packets:21 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:1000
Octets reçus:1877 (1.8 KB) Octets transmis:2913 (2.9 KB)

wlan0:avahi Link encap:Ethernet HWaddr 00:1f:3c:c1:d4:a7
inet adr:169.254.9.110 Bcast:169.254.255.255 Masque:255.255.0.0
UP BROADCAST MULTICAST MTU:1500 Metric:1

wmaster0 Link encap:UNSPEC HWaddr 00-1F-3C-C1-D4-A7-00-00-00-00-00-00-00-00-00-00
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)

julien@dell-desktop:~$ /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
julien@dell-desktop:~$ cat /etc/resolv.conf
# Generated by NetworkManager
domain sfr
search sfr
nameserver 192.168.1.1
julien@dell-desktop:~$ 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: 209.85.135.147
Name: www.l.google.com
Address: 209.85.135.99
Name: www.l.google.com
Address: 209.85.135.103
Name: www.l.google.com
Address: 209.85.135.104

julien@dell-desktop:~$ ping -c2 www.google.fr
PING www.l.google.com (209.85.135.104) 56(84) bytes of data.
64 bytes from mu-in-f104.google.com (209.85.135.104): icmp_seq=1 ttl=243 time=73.6 ms
64 bytes from mu-in-f104.google.com (209.85.135.104): icmp_seq=2 ttl=243 time=73.2 ms

--- www.l.google.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1004ms
rtt min/avg/max/mdev = 73.234/73.431/73.629/0.335 ms
julien@dell-desktop:~$ cat /etc/network/interfaces
auto lo
iface lo inet loopback
wpa-conf /etc/wpa_supplicant/wpa_supplicant.confX

julien@dell-desktop:~$ cat /etc/wpa_supplicant/wpa_supplicant.conf
ctrl_interface=/var/run/wpa_supplicant
eapol_version=1
ap_scan=1
fast_reauth=1

network={
ssid="Mon_EssiD"
scan_ssid=1
proto=WPA
key_mgmt=WPA-PSK
psk=ABCDEFGH
priority=5
julien@dell-desktop:~$

j'espere que vous aller pouvoir m'aider merci