The default module to PCI Wireless Card Realtek 8185 has weak signal, something between 5% to 15%, on Ubuntu 9.04 kernel 2.6.28 .
On Mandriva this network device work very well, don't need to worry !
Nevertheless we can solve this problem installing the modeule from Realtek to this device.
The steps are easy:

On Mandriva this network device work very well, don't need to worry !
Nevertheless we can solve this problem installing the modeule from Realtek to this device.
The steps are easy:
- Download driver from Realtek .
- Unzip the file .
- Inside the file do make and make install, then reboot
- This is a very dirt step, you must install libssl-dev. Try a cable connection to Internet.
- unzip wpa_supplicant-0.5.5.zip
- cp defconfig .config
- make and cp wpa_cli wpa_supplicant /usr/local/bin
- reboot and let the job for the networkmanager
