Dell Inspiron 1545 Wireless Slow Connection BCM4312

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http://askubuntu.com – Description: Wireless interface product: BCM4312 802.11b/g LP-PHY vendor: Broadcom Corporation Running Ubuntu 11.10. Wireless speeds are about 50-75% of what they usually are. Verified speeds on Windows 7 partition, so wireless card and router are both working properly. Any fix?? (HowTos)