联想g450 ubuntu无法上wifi

Broadcom BCM4312 802.11b/g LP-PHY
You only need the missing firmware:
Code:

sudo apt-get install firmware-b43-lpphy-installer

---

Remove the STA driver and its config, if applicable:
Code:

sudo apt-get remove --purge bcmwl-kernel-source
sudo rm /etc/modprobe.d/blacklist-bcm43.conf
sudo rm /etc/modprobe.d/broadcom-sta-common.conf
sudo rm /etc/modprobe.d/broadcom-sta-dkms.conf

Reboot.

http://ubuntuforums.org/showthread.php?t=2170117