It's important to download a driver directly from its source so you're sure you're getting the most valid, tested, and recent driver possible See How To Find and Download Drivers From Manufacturer Websites if you need help.As you can see in the screenshot above, I've visited Intel's site to download the driver for my Intel-based network card.
Bus 002 Device 004: ID 0bda:0129 Realtek Semiconductor Corp. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
It's advisable to build a kernel which does have the Real Tek8139 driver in any form, to avert unnecessary surprises.
If you don't know how to recompile the Linux kernel, I recommend you take a look at
By Mohan Lal Jangir This article has been written for kernel newcomers interested in learning about network device drivers.
It assumes that reader has a significant exposure to C and the Linux environment.