bom trabalho comigo. tente isso: D,
sudo apt-get install --reinstall linux-headers-$(uname -r) linux-headers-generic build-essential dkms
wget http://media.cdn.ubuntu-de.org/forum/attachments/44/18/3005217-r8168-dkms-8.029.00.tar.gz
sudo tar xvf 3005217-r8168-dkms-8.029.00.tar.gz -C /usr/src
sudo dkms add -m r8168-dkms -v 8.029.00
sudo dkms build -m r8168-dkms -v 8.029.00
sudo dkms install -m r8168-dkms -v 8.029.00
echo "blacklist r8169" | sudo tee -a /etc/modprobe.d/blacklist.conf
sudo modprobe -rfv r8169
sudo modprobe -v r8168
Espero que isso ajude você:)