We (http:system76.com) have fixed this problem on our Starling Netbook
that has an RTL8187B adapter. We downloaded and manually compiled the
latest driver from Realtek. It has to be requested via email at this
point.

Once you have the driver (which I've attached below for your
convenience) you have to unzip it, cd into the directory and run...

make
sudo make install

We also had to blacklist the rtl8187 module. The new module is called
r8187 (i.e. not rtl). If we didn't blacklist the rtl module, it was
loaded by default.

This increased our max range from about 40 feet to 120+ feet, and the 
connection seems rock solid.
Hopefully the fix will make it into Ubuntu.

** Attachment added: "rtl8187B_linux_26.1052.0225.2009.release.tar.gz"
   
http://launchpadlibrarian.net/29935624/rtl8187B_linux_26.1052.0225.2009.release.tar.gz

-- 
realtek rtl8187 weak signal, occasional slow performance
https://bugs.launchpad.net/bugs/293946
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