WPA Setup with Linsys WRT54G on Ubuntu

You need to install bcm43xx-fwcutter

Remove the line bcm43xx from /etc/modprobe.d/blacklist.

To begin go to your system configuration folder :

cd /etc/

Then create (or edit) a wpasupplicant configuration file :

sudo vi wpa_supplicant.conf

And adapt this sample to your context :

ctrl_interface=/var/run/wpa_supplicant
ap_scan=2
eapol_version=2
network={
ssid=""
pairwise=TKIP
group=TKIP
scan_ssid=1
proto=WPA
key_mgmt=WPA-PSK
psk=<your_encoded_WPA_KEY>
#priority=0
#auth_alg=OPEN
}

You need now to call this configuration file, so, go to your network configuration folder :

cd /etc/network/

And create (or edit) your interfaces configuration file :

sudo vi interfaces

And link your configuration to your interface :

auto lo
iface lo inet loopback

auto eth1
iface eth1 inet dhcp
wpa-conf /etc/wpa_supplicant.conf

And to auto connect your system to internet go to your default system launch folder :

cd /etc/default/

Create (or edit) a wpasupplicant script file :

sudo vi wpasupplicant

And, finally, adapt this content to your system in this file :

ENABLED=1
OPTIONS="-w -D wext -i eth1 -c /etc/wpa_supplicant.conf"