I am running Hardy and I was able to connect to the WPA-Enterprise and normal WPA networks without any problems until some time in August'08. I completely reinstalled xubuntu 8.04.1 but still can't connect to any WPA encrypted network. I tried Intrepid Alpha5  from a USB stick and got it working but only for a few minutes. Looking at all the other related bug reports I am a bit disappointed that basic stuff such as networking is still such a challenge for this distribution. Anyway, here is some data:

Thinkpad X60
NetworkManager: nm-applet 0.6.6

uname -a:
Linux rick-x60 2.6.24-19-generic #1 SMP Wed Aug 20 22:56:21 UTC 2008 i686 GNU/Linux

lsmod | grep iwl3945:
iwl3945                93940  0 
iwlwifi_mac80211      219108  1 iwl3945
cfg80211               15112  1 iwlwifi_mac80211
led_class               6020  1 iwl3945


modinfo iwl3945:
filename:       /lib/modules/2.6.24-19-generic/updates/wireless/iwlwifi/iwlwifi/compatible/iwl3945.ko
license:        GPL
author:         Copyright(c) 2003-2007 Intel Corporation
version:        1.2.25
description:    Intel(R) PRO/Wireless 3945ABG/BG Network Connection driver for Linux
srcversion:     FDE2E62843DE3ED112A50C3
alias:          pci:v00008086d00004227sv*sd*bc*sc*i*
alias:          pci:v00008086d00004222sv*sd*bc*sc*i*
depends:        led-class,iwlwifi_mac80211
vermagic:       2.6.24-19-generic SMP mod_unload 586 
parm:           antenna:select antenna (1=Main, 2=Aux, default 0 [both]) (int)
parm:           disable:manually disable the radio (default 0 [radio on]) (int)
parm:           hwcrypto:using hardware crypto engine (default 0 [software])
 (int)
parm:           debug:debug output mask (int)
parm:           disable_hw_scan:disable hardware scanning (default 0) (int)
parm:           queues_num:number of hw queues. (int)
parm:           qos_enable:enable all QoS functionality (int)


cat syslog | egrep -i "iwl3945|network|wlan":
Sep 19 22:04:03 rick-x60 kernel: [   14.160113] Intel(R) PRO/1000 Network Driver - version 7.3.20-k2-NAPI
Sep 19 22:04:03 rick-x60 kernel: [   14.287575] e1000: eth0: e1000_probe: Intel(R) PRO/1000 Network Connection
Sep 19 22:04:03 rick-x60 kernel: [   34.411228] iwl3945: Intel(R) PRO/Wireless 3945ABG/BG Network Connection driver for Linux, 1.2.25
Sep 19 22:04:03 rick-x60 kernel: [   34.411233] iwl3945: Copyright(c) 2003-2007 Intel Corporation
Sep 19 22:04:03 rick-x60 kernel: [   34.411421] iwl3945: Detected Intel PRO/Wireless 3945ABG Network Connection
Sep 19 22:04:03 rick-x60 NetworkManager: <info>  starting... 
Sep 19 22:04:04 rick-x60 avahi-daemon[5203]: Network interface enumeration completed.
Sep 19 22:04:05 rick-x60 NetworkManager: <info>  Found radio killswitch /org/freedesktop/Hal/devices/ipw_wlan_switch 
Sep 19 22:04:06 rick-x60 kernel: [   41.376337] iwl3945: Tunable channels: 13 802.11bg, 23 802.11a channels
Sep 19 22:04:06 rick-x60 NetworkManager: <info>  wlan0: Device is fully-supported using driver 'iwl3945'. 
Sep 19 22:04:06 rick-x60 NetworkManager: <info>  wlan0: driver does not support SSID scans (scan_capa 0x00). 
Sep 19 22:04:06 rick-x60 NetworkManager: <info>  nm_device_init(): waiting for device's worker thread to start 
Sep 19 22:04:06 rick-x60 NetworkManager: <info>  nm_device_init(): device's worker thread started, continuing. 
Sep 19 22:04:06 rick-x60 NetworkManager: <info>  Now managing wireless (802.11) device 'wlan0'. 
Sep 19 22:04:06 rick-x60 NetworkManager: <info>  Deactivating device wlan0. 
Sep 19 22:04:06 rick-x60 NetworkManager: <info>  eth0: Device is fully-supported using driver 'e1000'. 
Sep 19 22:04:06 rick-x60 NetworkManager: <info>  nm_device_init(): waiting for device's worker thread to start 
Sep 19 22:04:06 rick-x60 NetworkManager: <info>  nm_device_init(): device's worker thread started, continuing. 
Sep 19 22:04:06 rick-x60 NetworkManager: <info>  Now managing wired Ethernet (802.3) device 'eth0'. 
Sep 19 22:04:06 rick-x60 NetworkManager: <info>  Deactivating device eth0. 
Sep 19 22:04:06 rick-x60 NetworkManager: <debug> [1221858246.244422] nm_hal_device_added(): New device added (hal udi is '/org/freedesktop/Hal/devices/platform_bluetooth'). 
Sep 19 22:04:06 rick-x60 NetworkManager: <info>  Wireless now enabled by radio killswitch 
Sep 19 22:04:24 rick-x60 NetworkManager: <info>  Updating allowed wireless network lists. 
Sep 19 22:04:24 rick-x60 NetworkManager: <info>  SWITCH: no current connection, found better connection 'wlan0'. 
Sep 19 22:04:24 rick-x60 dhcdbd: message_handler: message handler not found under /com/redhat/dhcp/wlan0 for sub-path wlan0.dbus.get.reason
Sep 19 22:04:24 rick-x60 NetworkManager: <info>  Will activate connection 'wlan0/myhomewifi'. 
Sep 19 22:04:24 rick-x60 NetworkManager: <info>  Device wlan0 activation scheduled... 
Sep 19 22:04:24 rick-x60 NetworkManager: <info>  Activation (wlan0) started... 
Sep 19 22:04:24 rick-x60 NetworkManager: <info>  Activation (wlan0) Stage 1 of 5 (Device Prepare) scheduled... 
Sep 19 22:04:24 rick-x60 NetworkManager: <info>  Activation (wlan0) Stage 1 of 5 (Device Prepare) started... 
Sep 19 22:04:24 rick-x60 NetworkManager: <info>  Activation (wlan0) Stage 2 of 5 (Device Configure) scheduled... 
Sep 19 22:04:24 rick-x60 NetworkManager: <info>  Activation (wlan0) Stage 1 of 5 (Device Prepare) complete. 
Sep 19 22:04:24 rick-x60 NetworkManager: <info>  Activation (wlan0) Stage 2 of 5 (Device Configure) starting... 
Sep 19 22:04:24 rick-x60 NetworkManager: <info>  Activation (wlan0/wireless): access point 'myhomewifi' is encrypted, but NO valid key exists.  New key needed. 
Sep 19 22:04:24 rick-x60 NetworkManager: <info>  Activation (wlan0) New wireless user key requested for network 'myhomewifi'. 
Sep 19 22:04:24 rick-x60 NetworkManager: <info>  Activation (wlan0) Stage 2 of 5 (Device Configure) complete. 
Sep 19 22:04:25 rick-x60 kernel: [   60.421699] ADDRCONF(NETDEV_UP): wlan0: link is not ready
Sep 19 22:04:31 rick-x60 NetworkManager: <info>  Activation (wlan0) New wireless user key for network 'myhomewifi' received. 
Sep 19 22:04:31 rick-x60 NetworkManager: <info>  Activation (wlan0) Stage 1 of 5 (Device Prepare) scheduled... 
Sep 19 22:04:31 rick-x60 NetworkManager: <info>  Activation (wlan0) Stage 1 of 5 (Device Prepare) started... 
Sep 19 22:04:31 rick-x60 NetworkManager: <info>  Activation (wlan0) Stage 2 of 5 (Device Configure) scheduled... 
Sep 19 22:04:31 rick-x60 NetworkManager: <info>  Activation (wlan0) Stage 1 of 5 (Device Prepare) complete. 
Sep 19 22:04:31 rick-x60 NetworkManager: <info>  Activation (wlan0) Stage 2 of 5 (Device Configure) starting... 
Sep 19 22:04:31 rick-x60 NetworkManager: <info>  Activation (wlan0/wireless): access point 'myhomewifi' is encrypted, and a key exists.  No new key needed. 
Sep 19 22:04:32 rick-x60 NetworkManager: <info>  retry to connect to global supplicant socket (try=1) 
Sep 19 22:04:32 rick-x60 NetworkManager: <info>  SUP: sending command 'INTERFACE_ADD wlan0^I^Iwext^I/var/run/wpa_supplicant0^I' 
Sep 19 22:04:33 rick-x60 NetworkManager: <info>  SUP: response was 'OK' 
Sep 19 22:04:33 rick-x60 NetworkManager: <info>  SUP: sending command 'AP_SCAN 1' 
Sep 19 22:04:33 rick-x60 NetworkManager: <info>  SUP: response was 'OK' 
Sep 19 22:04:33 rick-x60 NetworkManager: <info>  SUP: sending command 'ADD_NETWORK' 
Sep 19 22:04:33 rick-x60 NetworkManager: <info>  SUP: response was '0' 
Sep 19 22:04:33 rick-x60 NetworkManager: <info>  SUP: sending command 'SET_NETWORK 0 ssid 66756e6e796e6574' 
Sep 19 22:04:33 rick-x60 NetworkManager: <info>  SUP: response was 'OK' 
Sep 19 22:04:33 rick-x60 NetworkManager: <info>  SUP: sending command 'SET_NETWORK 0 proto WPA' 
Sep 19 22:04:33 rick-x60 NetworkManager: <info>  SUP: response was 'OK' 
Sep 19 22:04:33 rick-x60 NetworkManager: <info>  SUP: sending command 'SET_NETWORK 0 key_mgmt WPA-PSK' 
Sep 19 22:04:33 rick-x60 NetworkManager: <info>  SUP: response was 'OK' 
Sep 19 22:04:33 rick-x60 NetworkManager: <info>  SUP: sending command 'SET_NETWORK 0 psk <key>' 
Sep 19 22:04:33 rick-x60 NetworkManager: <info>  SUP: response was 'OK' 
Sep 19 22:04:33 rick-x60 NetworkManager: <info>  SUP: sending command 'ENABLE_NETWORK 0' 
Sep 19 22:04:33 rick-x60 NetworkManager: <info>  SUP: response was 'OK' 
Sep 19 22:04:33 rick-x60 NetworkManager: <info>  Activation (wlan0) Stage 2 of 5 (Device Configure) complete. 
Sep 19 22:04:42 rick-x60 kernel: [   77.558051] wlan0: Initial auth_alg=0
Sep 19 22:04:42 rick-x60 kernel: [   77.558061] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:04:42 rick-x60 kernel: [   77.753907] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:04:42 rick-x60 kernel: [   77.953240] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:04:43 rick-x60 kernel: [   78.149094] wlan0: authentication with AP 00:0f:b5:15:da:32 timed out
Sep 19 22:04:47 rick-x60 NetworkManager: <info>  Old device 'wlan0' activating, won't change. 
Sep 19 22:05:01 rick-x60 kernel: [   96.574113] wlan0: Initial auth_alg=0
Sep 19 22:05:01 rick-x60 kernel: [   96.574123] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:05:01 rick-x60 kernel: [   96.575213] wlan0: Initial auth_alg=0
Sep 19 22:05:01 rick-x60 kernel: [   96.575221] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:05:01 rick-x60 kernel: [   96.769451] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:05:02 rick-x60 kernel: [   96.967474] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:05:02 rick-x60 kernel: [   97.166168] wlan0: authentication with AP 00:0f:b5:15:da:32 timed out
Sep 19 22:05:02 rick-x60 kernel: [   97.179834] wlan0: authentication frame received from 00:0f:b5:15:da:32, but not in authenticate state - ignored
Sep 19 22:05:06 rick-x60 NetworkManager: <info>  Old device 'wlan0' activating, won't change. 
Sep 19 22:05:20 rick-x60 kernel: [  115.529006] wlan0: Initial auth_alg=0
Sep 19 22:05:20 rick-x60 kernel: [  115.529015] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:05:20 rick-x60 kernel: [  115.530477] wlan0: Initial auth_alg=0
Sep 19 22:05:20 rick-x60 kernel: [  115.530485] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:05:21 rick-x60 kernel: [  115.726951] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:05:21 rick-x60 kernel: [  115.922857] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:05:21 rick-x60 kernel: [  116.120304] wlan0: authentication with AP 00:0f:b5:15:da:32 timed out
Sep 19 22:05:25 rick-x60 kernel: [  119.707353] wlan0: authentication frame received from 00:0f:b5:15:da:32, but not in authenticate state - ignored
Sep 19 22:05:25 rick-x60 NetworkManager: <info>  Old device 'wlan0' activating, won't change. 
Sep 19 22:05:40 rick-x60 kernel: [  134.552065] wlan0: Initial auth_alg=0
Sep 19 22:05:40 rick-x60 kernel: [  134.552075] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:05:40 rick-x60 kernel: [  134.555352] wlan0: Initial auth_alg=0
Sep 19 22:05:40 rick-x60 kernel: [  134.555359] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:05:40 rick-x60 kernel: [  134.751467] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:05:40 rick-x60 kernel: [  134.950248] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:05:40 rick-x60 kernel: [  135.148923] wlan0: authentication with AP 00:0f:b5:15:da:32 timed out
Sep 19 22:05:45 rick-x60 NetworkManager: <info>  Old device 'wlan0' activating, won't change. 
Sep 19 22:05:45 rick-x60 kernel: [  139.761819] wlan0: authentication frame received from 00:0f:b5:15:da:32, but not in authenticate state - ignored
Sep 19 22:05:59 rick-x60 kernel: [  153.549635] wlan0: Initial auth_alg=0
Sep 19 22:05:59 rick-x60 kernel: [  153.549644] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:05:59 rick-x60 kernel: [  153.748223] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:05:59 rick-x60 kernel: [  153.945838] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:05:59 rick-x60 kernel: [  154.144665] wlan0: authentication with AP 00:0f:b5:15:da:32 timed out
Sep 19 22:06:03 rick-x60 kernel: [  158.205217] wlan0: authentication frame received from 00:0f:b5:15:da:32, but not in authenticate state - ignored
Sep 19 22:06:04 rick-x60 NetworkManager: <info>  Old device 'wlan0' activating, won't change. 
Sep 19 22:06:04 rick-x60 kernel: [  158.636402] wlan0: authentication frame received from 00:0f:b5:15:da:32, but not in authenticate state - ignored
Sep 19 22:06:06 rick-x60 kernel: [  160.642686] wlan0: authentication frame received from 00:0f:b5:15:da:32, but not in authenticate state - ignored
Sep 19 22:06:18 rick-x60 kernel: [  172.571569] wlan0: Initial auth_alg=0
Sep 19 22:06:18 rick-x60 kernel: [  172.571579] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:06:18 rick-x60 kernel: [  172.574222] wlan0: Initial auth_alg=0
Sep 19 22:06:18 rick-x60 kernel: [  172.574229] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:06:18 rick-x60 kernel: [  172.771020] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:06:18 rick-x60 kernel: [  172.969219] wlan0: authenticate with AP 00:0f:b5:15:da:32
Sep 19 22:06:19 rick-x60 kernel: [  173.167219] wlan0: authentication with AP 00:0f:b5:15:da:32 timed out
Sep 19 22:06:21 rick-x60 kernel: [  176.057118] wlan0: authentication frame received from 00:0f:b5:15:da:32, but not in authenticate state - ignored
Sep 19 22:06:23 rick-x60 NetworkManager: <info>  Old device 'wlan0' activating, won't change. 
Sep 19 22:06:33 rick-x60 NetworkManager: <info>  Activation (wlan0/wireless): association took too long (>120s), failing activation. 
Sep 19 22:06:33 rick-x60 NetworkManager: <info>  Activation (wlan0) failure scheduled... 
Sep 19 22:06:33 rick-x60 NetworkManager: <info>  Activation (wlan0) failed for access point (myhomewifi) 
Sep 19 22:06:33 rick-x60 NetworkManager: <info>  Activation (wlan0) failed. 
Sep 19 22:06:33 rick-x60 NetworkManager: <info>  Deactivating device wlan0. 
Sep 19 22:06:38 rick-x60 kernel: [  192.615136] wlan0: authentication frame received from 00:0f:b5:15:da:32, but not in authenticate state - ignored
Sep 19 22:06:38 rick-x60 kernel: [  192.667885] wlan0: authentication frame received from 00:0f:b5:15:da:32, but not in authenticate state - ignored
Sep 19 22:06:38 rick-x60 kernel: [  192.769991] wlan0: authentication frame received from 00:0f:b5:15:da:32, but not in authenticate state - ignored