#Wi-Fi для сетевой карты broadcom 802.11g в Ubuntu https://help.ubuntu.com/community/WifiDocs/Driver/bcm43xx
##b43 - No Internet access
If you do not have any other means of Internet access from Ubuntu, then you will have to download the firmware from another computer with Internet access, from an existing OS on another partition, or before you install Ubuntu. You will also need the b43-fwcutter package which is usually included on the install media or can be downloaded from the official online repositories.
Install the b43-fwcutter package. This is usually located on the Ubuntu install media under /cdrom/pool/main/b/b43-fwcutter/ or you can download the binary '.deb' package by following the links on launchpad.
Double click on the package to install or in a Terminal issue the following commands:
cd /cdrom/pool/main/b/b43-fwcutter/
sudo dpkg -i b43-fwcutter*
On a computer with Internet access, download the required firmware file:
b43legacy - http://downloads.openwrt.org/sources/wl_apsta-3.130.20.0.o
b43 (10.04 Lucid Lynx) - http://mirror2.openwrt.org/sources/broadcom-wl-4.150.10.5.tar.bz2
b43 (12.04 Precise Pangolin) - http://mirror2.openwrt.org/sources/broadcom-wl-5.10.56.27.3_mipsel.tar.bz2
b43 (14.04 Trusty Tahr) - http://www.lwfinger.com/b43-firmware/broadcom-wl-5.100.138.tar.bz2
For the latest information on what files to download see http://wireless.kernel.org/en/users/Drivers/b43#Other_distributions_not_mentioned_above and http://wireless.kernel.org/en/users/Drivers/b43/developers .
Copy the downloaded file to your home folder. Open a new Terminal and use b43-fwcutter to extract and install the firmware:
###b43legacy
sudo b43-fwcutter -w /lib/firmware wl_apsta-3.130.20.0.o
###b43 (10.04 Lucid Lynx)
tar xfvj broadcom-wl-4.150.10.5.tar.bz2
sudo b43-fwcutter -w /lib/firmware broadcom-wl-4.150.10.5/driver/wl_apsta_mimo.o
###b43 (12.04 Precise Pangolin)
tar xfvj broadcom-wl-5.10.56.27.3_mipsel.tar.bz2
sudo b43-fwcutter -w /lib/firmware broadcom-wl-5.10.56.27.3/driver/wl_apsta/wl_prebuilt.o
либо
sudo b43-fwcutter -w /lib/firmware wl_prebuilt.o #непосредственно из папки, в которой находится файл wl_prebuilt.o
###b43 (14.04 Trusty Tahr)
tar xfvj broadcom-wl-5.100.138.tar.bz2
sudo b43-fwcutter -w /lib/firmware broadcom-wl-5.100.138/linux/wl_apsta.o
Restart the computer or reload the b43/b43legacy module as outlined in the Switching between drivers section below (replace b43 with b43legacy where appropriate).