I have the same (or at least a similar) problem. Here are my logs:
...
Aug 5 21:27:56 xyz-desktop NetworkManager: <info> Config: added 'psk' value
'<omitted>'
Aug 5 21:27:56 xyz-desktop NetworkManager:
nm_setting_802_1x_get_pkcs11_engine_path: assertion `NM_IS_SETTING_802_1X
(setting)' failed
Aug 5 21:27:56 xyz-desktop NetworkManager:
nm_setting_802_1x_get_pkcs11_module_path: assertion `NM_IS_SETTING_802_1X
(setting)' failed
Aug 5 21:27:56 xyz-desktop NetworkManager: <info> Activation (wlan0) Stage 2
of 5 (Device Configure) complete.
Aug 5 21:27:56 xyz-desktop NetworkManager: <info> Config: set interface
ap_scan to 1
Aug 5 21:27:56 xyz-desktop NetworkManager: <info> (wlan0): supplicant
connection state: disconnected -> scanning
Aug 5 21:28:41 xyz-desktop NetworkManager: <info> (wlan0): device state
change: 5 -> 3 (reason 0)
Aug 5 21:28:41 xyz-desktop NetworkManager: <info> (wlan0): deactivating
device (reason: 0).
Aug 5 21:28:41 xyz-desktop NetworkManager: <info> Activation (wlan0) starting
connection 'xyz'
Aug 5 21:28:41 xyz-desktop NetworkManager: <info> (wlan0): device state
change: 3 -> 4 (reason 0)
Aug 5 21:28:41 xyz-desktop NetworkManager: <info> Activation (wlan0) Stage 1
of 5 (Device Prepare) scheduled...
Aug 5 21:28:41 xyz-desktop NetworkManager: <info> Activation (wlan0) Stage 1
of 5 (Device Prepare) started...
Aug 5 21:28:41 xyz-desktop NetworkManager: <info> Activation (wlan0) Stage 2
of 5 (Device Configure) scheduled...
Aug 5 21:28:41 xyz-desktop NetworkManager: <info> Activation (wlan0) Stage 1
of 5 (Device Prepare) complete.
Aug 5 21:28:41 xyz-desktop NetworkManager: <info> Activation (wlan0) Stage 2
of 5 (Device Configure) starting...
Aug 5 21:28:41 xyz-desktop NetworkManager: <info> (wlan0): device state
change: 4 -> 5 (reason 0)
Aug 5 21:28:41 xyz-desktop NetworkManager: <info> Activation
(wlan0/wireless): access point 'xyz' has security, but secrets are required.
Aug 5 21:28:41 xyz-desktop NetworkManager: <info> (wlan0): device state
change: 5 -> 6 (reason 0)
Aug 5 21:28:41 xyz-desktop NetworkManager: <info> Activation (wlan0) Stage 2
of 5 (Device Configure) complete.
Aug 5 21:28:41 xyz-desktop NetworkManager: <info> (wlan0): supplicant
connection state: scanning -> disconnected
Aug 5 21:28:44 xyz-desktop NetworkManager: <info> Activation (wlan0) Stage 1
of 5 (Device Prepare) scheduled...
Aug 5 21:28:44 xyz-desktop NetworkManager: <info> Activation (wlan0) Stage 1
of 5 (Device Prepare) started...
Aug 5 21:28:44 xyz-desktop NetworkManager: <info> (wlan0): device state
change: 6 -> 4 (reason 0)
Aug 5 21:28:44 xyz-desktop NetworkManager: <info> Activation (wlan0) Stage 2
of 5 (Device Configure) scheduled...
Aug 5 21:28:44 xyz-desktop NetworkManager: <info> Activation (wlan0) Stage 1
of 5 (Device Prepare) complete.
Aug 5 21:28:44 xyz-desktop NetworkManager: <info> Activation (wlan0) Stage 2
of 5 (Device Configure) starting...
Aug 5 21:28:44 xyz-desktop NetworkManager: <info> (wlan0): device state
change: 4 -> 5 (reason 0)
Aug 5 21:28:44 xyz-desktop NetworkManager: <info> Activation
(wlan0/wireless): connection 'xyz' has security, and secrets exist. No new
secrets needed.
Aug 5 21:28:44 xyz-desktop NetworkManager: <info> Config: added 'ssid' value
'xyz'
Aug 5 21:28:44 xyz-desktop NetworkManager: <info> Config: added 'scan_ssid'
value '1'
Aug 5 21:28:44 xyz-desktop NetworkManager: <info> Config: added 'key_mgmt'
value 'WPA-PSK'
Aug 5 21:28:44 xyz-desktop NetworkManager: <info> Config: added 'psk' value
'<omitted>'
Aug 5 21:28:44 xyz-desktop NetworkManager:
nm_setting_802_1x_get_pkcs11_engine_path: assertion `NM_IS_SETTING_802_1X
(setting)' failed
Aug 5 21:28:44 xyz-desktop NetworkManager:
nm_setting_802_1x_get_pkcs11_module_path: assertion `NM_IS_SETTING_802_1X
(setting)' failed
Aug 5 21:28:44 xyz-desktop NetworkManager: <info> Activation (wlan0) Stage 2
of 5 (Device Configure) complete.
Aug 5 21:28:44 xyz-desktop NetworkManager: <info> Config: set interface
ap_scan to 1
Aug 5 21:28:44 xyz-desktop NetworkManager: <info> (wlan0): supplicant
connection state: disconnected -> scanning
Aug 5 21:29:44 xyz-desktop NetworkManager: <info> Activation
(wlan0/wireless): association took too long.
Aug 5 21:29:44 xyz-desktop NetworkManager: <info> (wlan0): device state
change: 5 -> 6 (reason 0)
Aug 5 21:29:44 xyz-desktop NetworkManager: <info> Activation
(wlan0/wireless): asking for new secrets
Aug 5 21:29:44 xyz-desktop NetworkManager: <info> (wlan0): supplicant
connection state: scanning -> disconnected
Aug 5 21:29:50 xyz-desktop NetworkManager: <info> Activation (wlan0) Stage 1
of 5 (Device Prepare) scheduled...
Aug 5 21:29:50 xyz-desktop NetworkManager: <info> Activation (wlan0) Stage 1
of 5 (Device Prepare) started...
Aug 5 21:29:50 xyz-desktop NetworkManager: <info> (wlan0): device state
change: 6 -> 4 (reason 0)
Aug 5 21:29:50 xyz-desktop NetworkManager: <info> Activation (wlan0) Stage 2
of 5 (Device Configure) scheduled...
Aug 5 21:29:50 xyz-desktop NetworkManager: <info> Activation (wlan0) Stage 1
of 5 (Device Prepare) complete.
Aug 5 21:29:50 xyz-desktop NetworkManager: <info> Activation (wlan0) Stage 2
of 5 (Device Configure) starting...
Aug 5 21:29:50 xyz-desktop NetworkManager: <info> (wlan0): device state
change: 4 -> 5 (reason 0)
Aug 5 21:29:50 xyz-desktop NetworkManager: <info> Activation
(wlan0/wireless): connection 'xyz' has security, and secrets exist. No new
secrets needed.
Aug 5 21:29:50 xyz-desktop NetworkManager: <info> Config: added 'ssid' value
'xyz'
Aug 5 21:29:50 xyz-desktop NetworkManager: <info> Config: added 'scan_ssid'
value '1'
Aug 5 21:29:50 xyz-desktop NetworkManager: <info> Config: added 'key_mgmt'
value 'WPA-PSK'
Aug 5 21:29:50 xyz-desktop NetworkManager: <info> Config: added 'psk' value
'<omitted>'
...
uname:
Linux xyz-desktop 2.6.32-24-generic #39-Ubuntu SMP Wed Jul 28 05:14:15
UTC 2010 x86_64 GNU/Linux
iwconfig wlan0
wlan0 IEEE 802.11bg ESSID:"xyz"
Mode:Managed Frequency:2.467 GHz Access Point: 00:88:15:00:88:15
Bit Rate=1 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=15/100 Signal level=15/100
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
lspci:
03:02.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8185 IEEE
802.11a/b/g Wireless LAN Controller (rev 20)
Subsystem: Realtek Semiconductor Co., Ltd. RTL-8185 IEEE 802.11a/b/g
Wireless LAN Controller
Flags: bus master, medium devsel, latency 32, IRQ 22
I/O ports at e400 [size=256]
Memory at febff400 (32-bit, non-prefetchable) [size=512]
Capabilities: [50] Power Management version 2
Kernel driver in use: rtl8180
Kernel modules: rtl8180
sometimes reboot / power cycle helps ...
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[lucid lynx beta2 64b] : wifi connection doesn't work
https://bugs.launchpad.net/bugs/568244
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