server - Connecting to a wireless network

I have a machine that I just installed Ubuntu Server on. The only problem is that I do not know how to connect it to a wireless network, and I cannot use a network cable to connect it to my router.

When trying to list the network cards, only the loopback interface showed up:

$ ifconfig
lo        Link encap:Local Loopback

          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric 1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

which was unexpected, as both my Ethernet network interface (eth0) and wireless network interface (wlan0) showed up when doing the same in a fresh installation of Ubuntu Desktop 10.10.

So, my two questions are:

• how can I install the wireless drivers (and packages I could download etc.) and/or set up the wireless network interface to work properly, and


• how can I connect to a WPA-encrypted wireless network from the command line?

EDIT:

I ended up uninstalling Ubuntu Server and installing Ubuntu Desktop instead, then configuring the wireless network through the GUI and making it boot into command line instead of GNOME.