Problèmes wifi sous Ubuntu 8.04 sur HP DV4000

Bonjour,
Débutant sous linux
J'ai changé de modem pour tester le wifi
Sous win xp ça fonctionne
mais sous Ubuntu pas
En Ethernet ça marche mais pas en wifi
Après pas mal de recherches et d'essais, je n'y arrive toujours pas...

ma config:

Portable HP DV4000
carte wifi intégrée Intel 2200BG

Modem routeur Belkin N MIMO
Linux Ubuntu 8.04.1
Firefox 3.0.4


Voici ce que donnent les commandes

serge@serge-laptop:~$ /sbin/iwconfig
-------------------------------------------------------
lo no wireless extensions.

eth0 no wireless extensions.

eth1 unassociated ESSID:""
Mode:Managed Channel=0 Access Point: Not-Associated
Bit Rate:0 kb/s Tx-Power=20 dBm Sensitivity=8/0
Retry limit:7 RTS thr:off Fragment thr:off
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

serge@serge-laptop:~$ /sbin/ifconfig
-------------------------------------------------------
eth0 Link encap:Ethernet HWaddr 00:0a:e4:df:d2:cc
inet adr:192.168.2.4 Bcast:192.168.2.255 Masque:255.255.255.0
adr inet6: fe80::20a:e4ff:fedf:d2cc/64 Scope:Lien
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Packets reçus:131000 erreurs:0 :0 overruns:0 frame:0
TX packets:77496 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:1000
Octets reçus:179184433 (170.8 MB) Octets transmis:6554583 (6.2 MB)
Interruption:19 Adresse de base:0x4000

eth1 Link encap:Ethernet HWaddr 00:15:00:4f:8c:7c
UP BROADCAST MULTICAST MTU:1500 Metric:1
Packets reçus:30910 erreurs:0 :0 overruns:0 frame:0
TX packets:6003 errors:0 dropped:0 overruns:0 carrier:1
collisions:0 lg file transmission:1000
Octets reçus:0 (0.0 B) Octets transmis:84 (84.0 B)
Interruption:19 Adresse de base:0x8000 Mémoire:c8206000-c8206fff

eth1:avahi Link encap:Ethernet HWaddr 00:15:00:4f:8c:7c
inet adr:169.254.5.159 Bcast:169.254.255.255 Masque:255.255.0.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
Interruption:19 Adresse de base:0x8000 Mémoire:c8206000-c8206fff

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:56 erreurs:0 :0 overruns:0 frame:0
TX packets:56 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:0
Octets reçus:4496 (4.3 KB) Octets transmis:4496 (4.3 KB)



serge@serge-laptop:~$ /sbin/route -n
Table de routage IP du noyau
Destination Passerelle Genmask Indic Metric Ref Use Iface
192.168.2.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1
169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0
0.0.0.0 192.168.2.1 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 eth1



serge@serge-laptop:~$ cat /etc/resolv.conf
### BEGIN INFO
#
# Modified_by: NetworkManager
# Process: /usr/bin/NetworkManager
# Process_id: 5126
#
### END INFO

search Belkin


nameserver 192.168.2.1


serge@serge-laptop:~$ nslookup www.google.fr
Server: 192.168.2.1
Address: 192.168.2.1#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: 216.239.59.104
Name: www.l.google.com
Address: 216.239.59.99
Name: www.l.google.com
Address: 216.239.59.103

serge@serge-laptop:~$ ping -c2 www.google.fr
PING www.google.fr (66.102.9.99) 56(84) bytes of data.

64 bytes from 66.102.9.99: icmp_seq=1 ttl=244 time=33.7 ms
64 bytes from 66.102.9.99: icmp_seq=2 ttl=244 time=33.2 ms

--- www.google.fr ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 5271ms
rtt min/avg/max/mdev = 33.228/33.475/33.722/0.247 ms
serge@serge-laptop:~$
serge@serge-laptop:~$
serge@serge-laptop:~$ cat /etc/network/interfaces
auto lo
iface lo inet loopback

++++++++++++++++++++++++++++++++++++++++++++++++

serge@serge-laptop:~$ cat /etc/wpa_supplicant/wpa_supplicant.conf
ctrl_interface=/var/run/wpa_supplicant
eapol_version=1
ap_scan=1
fast_reauth=1

network={
ssid="Belkin_N_ADSL_81D0F3"
scan_ssid=1
proto=WPA
key_mgmt=WPA-PSK
psk=xxxxxxxxxxxxx
priority=5
}

Merci de m'aider à y voir clair...

A bientôt
Serge