Use 3G modem on Intel Galileo Gen 2

I'm working on a project and I use Intel Galileo Gen 2 with Yocto Project Linux. I use LAN to coect to Inteet but I would want to coect to Inteet with 3G USB modem.

I tried using Sakis3G to coect my 3G USB modem with my Intel Galileo and use Inteet through it. But I couldn't install it.

I don't want to use any additional hardware or shields, only through software.

Can you suggest and help me to create an Inteet coection using 3G USB modem?