[ubuntu] Wireless Issues

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http://ubuntuforums.org – I ramble (if you've read any of my other help threads), so I'll keep this short. OS - 12.04 Model - Linksys WMP300N Proven to work - Sorta. Firmware release by Broadcom is out, but is pretty poor. Chipset - US. Brcm4321 chipset Problem - Horrible download speeds ( <400KB/s. Should be 2-4MB/s). Webpages take forever to load. Connection will drop under 3/4 bar conditions. Causes frequent system halts(Could be graphics card). Won't connect now. Says SSID is wrong. Help? (Hardware)