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This question already has an answer here:

I just installed Ubuntu 14.4 instead of windows (now this is the only OS on my laptop) I have Broadcom bcm9506 card. How can I fix this? I already looked at a lot of similar questions but non of them help me.

 lspci -vnn | grep Network
04:00.0 Network controller [0280]: Broadcom Corporation BCM4312 802.11b/g LP-PHY [14e4:4315] (rev 01)

Thanks

marked as duplicate by Jorge Castro, Zanna, Arronical, David Foerster, mikewhatever Oct 14 '16 at 11:27

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • post result of running lspci -vnn | grep Network in terminal. don't forget post it in question – αғsнιη Sep 8 '14 at 6:24
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just run following command in terminal one by one:

sudo apt-get update
sudo update-pciids
sudo apt-get install firmware-b43-installer
sudo reboot

cuted from Installing Broadcom Wireless Drivers

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