|"I tried to install LAN driver from gigabyte"|
Why Gigabyte? Only Lenovo have the correct drivers for Lenovo laptops. Gigabyte has nothing to do with your laptop. Anyway, it's not a driver issue.
If Device Manager isn't showing a wired connection network adapter, and there are no error symbols in there, it means the wired connection adapter is faulty. Windows can't find it because of the faulty component.
Contact Lenovo to have it repaired.