I had a similar problem here, using the default rt2500pci driver. I
found that my Belkin RT2500-based PCI card would not see or connect to
any wireless points unless I pulled out my wired Ethernet card (leaving
the wireless as the only network interface). After this, NetworkManager
would be able to see and connect to networks, but I could not
successfully configure a wireless network manually. The solution is to
configure /etc/network/interfaces with the following:
auto wlan0
iface wlan0 inet dhcp
pre-up ifconfig wlan0 down
wpa-driver wext
wpa-key-mgmt WPA-PSK
wpa-proto WPA
wpa-ssid <ssid>
wpa-psk <passphrase>
pre-up sleep 20
pre-up ifconfig wlan0 up
Note that the passphrase is stored in clear text, which is a potential
security problem. Also, moving between a NetworkManager-managed
connection to a manually-defined one requires a reboot.
** Changed in: linux-ubuntu-modules-2.6.22 (Ubuntu)
Sourcepackagename: None => linux-ubuntu-modules-2.6.22
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rt2500 network no start
https://bugs.launchpad.net/bugs/152027
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