The link for the Linksys WUSB300N drivers that was hosted at http://www.atvnation.com/WUSB300N.tar is no longer working. You can find the files you will need to get your linksys adapter to work in linux at http://rapidshare.com/files/440352219/WUSB300N.tar

If your running Ubuntu you can install the drivers using the following instructions

The following instructions will be executed in terminal

Install ndiswrapper
sudo apt-get install ndisgtk

Extract the files from WUSB300N.tar
tar -xvf WUSB300N.tar

Installing the Windows driver using ndiswrapper
sudo ndiswrapper -i netmw245.inf

Check if the driver is installed correctly
sudo ndiswrapper -l

If the driver is installed correctly, you should see the following output:

Installed ndis drivers:
{name of driver} driver present, hardware present

or
{name of driver} : driver installed
device ({Chipset ID}) present

If everything looks good, lets load the new driver into memory

sudo depmod -a
sudo modprobe ndiswrapper

Check your system logs for any errors

tail -f /var/log/messages

Finally we have to set our new module to load at startup

sudo ndiswrapper -m

If the driver is installed correctly, you should see the following output: 

  Installed ndis drivers:
  {name of driver} driver present, hardware present

or

  {name of driver} : driver installed
       device ({Chipset ID}) present