Ubuntu 9.04 can't connect to wireless network?

"What software do you use? Try wicd:

$ sudo apt-get install wicd"

"When I upgraded to Kubuntu 9.04 I had the same problem.
I had to uninstall the Plasma Manager for Wireless,
Install wicd
And configure wicd to manage my Wireless Network - no problems since then."

Your system version is VERY old.....I'd suggest upgrading to AT LEAST 12.04.x LTS so that you get the newer driver set and improvements. The Ubuntu at your level might not have the appropriate drivers, and of course lacking the later security modifications to make your system safer.

"I had the same problem when I updated from Debian Squeeze to Wheezy - I use an Atheros AR5416 card that worked fine before upgrade and wouldn't connect at all after the upgrade. It would just keep prompting me for the passphrase. I'm using a plain-vanilla NetworkManager configuration, without any specifications for wlan0 in /etc/network/interfaces.

The fix was to add the following stanza to /etc/wpa_supplicant/wpa_supplicant.conf:

network={
ssid=""your-ssid""
key_mgmt=WPA-PSK
auth_alg=OPEN
psk=""your-passphrase""
priority=1
}

I restarted the machine and it worked."