Problème connexion wifi ubuntu 9.04

Bonjour,

J'ai tout essayé, tout ce que j'ai pu obtenir sur forum divers et variés, je n'arrive pas à me connecter en wifi sous ubuntu 9.04 avec carte intel pro wireless 3945 abg sur acer 9920g.
Tout marchait impeccablement avant que je ne fasse un échange standard de routeur (bewan ibox v0.1 chez sfr/tele2), le premier ayant rendu l'âme sous la foudre...
Problème : network manager rame puis me redemande ma clé WEP.

/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.

/sbin/ifconfig :

eth0 Link encap:Ethernet HWaddr 00:a0:d1:a2:3c:6d
inet adr:192.168.1.134 Bcast:192.168.1.255 Masque:255.255.255.0
adr inet6: fe80::2a0:d1ff:fea2:3c6d/64 Scope:Lien
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Packets reçus:12461 erreurs:0 :0 overruns:0 frame:0
TX packets:12055 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:1000
Octets reçus:11193565 (11.1 MB) Octets transmis:2490380 (2.4 MB)
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:58 erreurs:0 :0 overruns:0 frame:0
TX packets:58 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:0
Octets reçus:9232 (9.2 KB) Octets transmis:9232 (9.2 KB)

wlan0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
adr inet6: fe80::21b:77ff:fee7:9df6/64 Scope:Lien
UP BROADCAST MULTICAST MTU:1500 Metric:1
Packets reçus:0 erreurs:0 :0 overruns:0 frame:0
TX packets:157 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:1000
Octets reçus:0 (0.0 B) Octets transmis:36959 (36.9 KB)

wlan0:avahi Link encap:Ethernet HWaddr 00:00:00:00:00:00
inet adr:169.254.11.1 Bcast:169.254.255.255 Masque:255.255.0.0
UP BROADCAST MULTICAST MTU:1500 Metric:1

wmaster0 Link encap:UNSPEC HWaddr 00-1B-77-E7-9D-F6-00-00-00-00-00-00-00-00-00-00
UP RUNNING MTU:0 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 :

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 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 wlan0
0.0.0.0 192.168.1.254 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
domain tele2
search tele2
nameserver 192.168.1.254

nslookup www.google.fr :

Server: 192.168.1.254
Address: 192.168.1.254#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: 209.85.229.105
Name: www.l.google.com
Address: 209.85.229.147
Name: www.l.google.com
Address: 209.85.229.103
Name: www.l.google.com
Address: 209.85.229.106
Name: www.l.google.com
Address: 209.85.229.104
Name: www.l.google.com
Address: 209.85.229.99

ping -c2 www.google.fr :

PING www.l.google.com (209.85.229.103) 56(84) bytes of data.
64 bytes from ww-in-f103.google.com (209.85.229.103): icmp_seq=1 ttl=55 time=61.3 ms
64 bytes from ww-in-f103.google.com (209.85.229.103): icmp_seq=2 ttl=55 time=61.7 ms

--- www.l.google.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1000ms
rtt min/avg/max/mdev = 61.335/61.564/61.793/0.229 ms

cat /etc/network/interfaces :

auto wlan0
iface wlan0 inet dhcp
wireless-essid XXXX_XXX
wireless-key BCDE12345
auto lo
iface lo inet loopback

cat /etc/wpa_supplicant/wpa_supplicant.conf :

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

network={
ssid="XXXXX_XXX"
scan_ssid=1
proto=WPA
key_mgmt=WPA-PSK
psk=ABCDEF1234
priority=5

voilà, vous savez tout, merci à ceux ou celles qui prendront un peu de temps !