I use Ubuntu 10.04 with an Alfa Network AWUS036H USB wireless adaptor with a Realtek chipset RTL8187L.
With this procedure, everything will work perfect !
1) Download THIS driver (previous version didn't work for me):
http://www.realtek.com.tw/downloads/...=true#RTL8187L
or (this is the same file):
http://www.4shared.com/file/BSepYhR2...08202010r.html
2) Extract
3) Open a terminal window, go to where you extracted.
4) run:
sudo make
5) run:
sudo make install
6) reboot
In my case, when the network manager applet said "connected" I have to wait about a minute to start browsing the web.
Everything works pefect, never disconnect, etc.
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