Ubuntu: How to make broadcom wireless cards work?

Took me a long time to figure this out. Apparently the procedure varies depending on the card's chipset. I have Acer Aspire 3000, Ubuntu 8.10 and Broadcom Corporation BCM4306 802.11b/g Wireless LAN Controller (rev 02). Try out the following tutorials:

• Broadcom Wireless cards without Ndiswrapper for Dapper and Edgy (Main post | Reply | download Airport Extreme firmware wl_apsta.o).
• Broadcom Wireless Firmware (works on Ubuntu and other operating systems).

...worked out fine for me.