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Since I cannot get my wireless card Broadcom BCM4313 working properly at home, I thought I could buy a usb wifi external adapter (I found this Dlink DWA-125). Would this device bypass bcm4313 and its related driver? Could I get a decent speed connection this way?

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I'd think that troubleshooting your Broadcom would be more likely to succeed. If it just can't be made to work (which I doubt) it can be blacklisted. Whether the DWA-125 would work better depends on your router, encryption, et al and many details. I believe the driver for the DWA-125 is rt2800usb included in the 12.04 kernel by default. –  chili555 Nov 20 '12 at 14:49
Regarding broadcom problems: askubuntu.com/questions/94021/… answer by jokerdino still is valid. –  Rinzwind Nov 20 '12 at 15:35
thank you for fast reply! I spent planty of time trying to make it work: I tried installing/removing proprietary drivers, disabling ipv6, disabling wireless card power management through editing /etc/rc.local, but I did not succeed... The fact is that I have this issue connecting to a Netgear dng1000, which is instlled at home, and to my town's public library. But I tried also to connect to friend's routers (not-Netgear) and University network and it works perfectly –  alaska-sca Nov 20 '12 at 15:35
What is your exact card? lspci -nn –  chili555 Nov 20 '12 at 15:38
01:00.0 Network controller [0280]: Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller [14e4:4727] (rev 01) –  alaska-sca Nov 20 '12 at 15:44

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