lspci | grep -i ethernet
gives the same for livecd and fresh install:
02:00.1 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 12)`
lsmod | grep -i r816.*
also gives that module r8169
is loaded on both systems
Configuration through network manager is also the same. But for some reason ethernet works fine on livecd, and doesn't work on the installed system