Comment 59 for bug 1779817

This is the only solution that worked for me: https://askubuntu.com/a/1053520/222403

Installing the lastest version of the r8168 driver found at http://mirrors.edge.kernel.org/ubuntu/pool/universe/r/r8168/ (r8168-dkms_8.046.00-1_all.deb)

Cheers!