Just installed Ubuntu Server 12.04 on my laptop. The desktop version always had driver issues but only with WiFi not the ethernet, and I could just hard wire and install the proprietary drivers manually and it would work. But on my installed server I get no Ethernet connectivity.
ifconfig only shows
lo for loopback an not
eth0 like usual.
lshw -C network *-network DISABLED description: Ethernet interface
ifconfig up up: error fetching interface information: device unknown
showed that by b34 and b44 modules are there but they were showing 0 in the column for in USE and no programs were using them, but b44 was using another program.
lspci -nnk | grep -i -A2 net 05:00.0 Network Controller 0280 Broadcom Corporation, BCM4311 802.11B/G WLAN 14E4:4311 REV 01 Subsystem: Dell Wireless 1390WLAN mini card 102b:007 Kernel driver in use b43-pic-brige Kernel module: ssb 08:00.0 Ethernet Controller 0200 Broadcom Corporation, BCM4401-B0 100BASE-TX 14E4:170C REV 02 Subsystem Dell Device 102B01f5 Kernel driver in use b44