Abaixo estão os resultados para o comando sudo lshw -c network . Acredito que "UNCLAIMED" se refere a drivers ausentes.
*-network UNCLAIMED
description: Network controller
product: BCM4311 802.11b/g WLAN
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:0c:00.0
version: 01
width: 32 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: latency=0
resources: memory:f1ffc000-f1ffffff
*-network
description: Ethernet interface
product: NetXtreme BCM5755M Gigabit Ethernet PCI Express
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:09:00.0
logical name: eth0
version: 02
serial: 00:1c:23:2f:06:45
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.116 firmware=5755m-v3.29 latency=0 link=no multicast=yes port=twisted pair
resources: irq:45 memory:f1ef0000-f1efffff
O driver STA no 11.04 não funciona devido a um problema no kernel. Você terá que instalar o firmware B43xx. Basta instalar o firmware-b43-installer a partir do centro de software ou synaptic.
Você também pode fazer isso a partir da linha de comando.
sudo apt-get instala o firmware-b43-installer