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I have a REALTEK RTL8187 WIRE LESS ADAPTER.

When I install xubuntu all goes fine, it lets me imput my WEP key, all good, but when I open any updating program or firefox server not found connection..
How can I fix it?

try the ubuntu forums - u will get answer in minute or theyr #ubuntu in IRC

I had to download a driver.
Or you can try to use a virtual machine.