I downloaded the file to a flash drive
In that case just cut and paste the driver that's on the flash drive and paste it to your desktop.
There are 2 ways to install that driver.
-Once the driver is on your desktop right click on it. When you do you should have an option in the drop down menu to install .deb package or something close to that.
-You can open the terminal and put in the command to install the driver but you have to 'change the directory' using
dpkg -i (name of driver)
If that's hard you can open the terminal and type:
Also if you could say what distribution of Linux you are running I could find a webpage to help you on the how to-