Your syslog clearly shows that the killswitch has disabled wireless
which is why Network-Manager doesn't see it:

Mar 30 09:13:42 acer-one-dezsi NetworkManager: <info>  starting... 
Mar 30 09:13:42 acer-one-dezsi NetworkManager: <info>  Found radio killswitch 
/org/freedesktop/Hal/devices/platform_acer_wmi_rfkill_acer_wireless_wlan 
Mar 30 09:13:42 acer-one-dezsi NetworkManager: <info>  (eth0): new Ethernet 
device (driver: 'r8169') 
Mar 30 09:13:42 acer-one-dezsi NetworkManager: <info>  (eth0): exported as 
/org/freedesktop/Hal/devices/net_00_1e_68_bf_fe_94 
Mar 30 09:13:42 acer-one-dezsi NetworkManager: <info>  Trying to start the 
supplicant... 
Mar 30 09:13:42 acer-one-dezsi NetworkManager: <info>  Trying to start the 
system settings daemon... 
Mar 30 09:13:42 acer-one-dezsi NetworkManager: <info>  Wireless now disabled by 
radio killswitch 

I would suggest that you do a re-install and/or remove madwifi, it's
been deprecated in favor of ath5k.

Does your device have a physical kill switch for the wireless?



** Changed in: network-manager (Ubuntu)
       Status: New => Incomplete

-- 
Ubuntu can't use Atheros wifi on ACER ASPIRE ONE. It was the problem before I 
made enable madwifi. And on 8.10 Ubuntu too.
https://bugs.launchpad.net/bugs/351419
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