quick fix
rmmod r8169
modprobe r8169
systemd
cat <<EOF| sudo tee /etc/systemd/system/load-realtek-driver.service
[Unit]
Description=Load Realtek drivers.
Before=network-online.target
[Service]
Type=simple
ExecStartPre=/usr/sbin/rmmod r8169
ExecStart=/usr/sbin/modprobe r8169
[Install]
WantedBy=multi-user.target
EOF
sudo systemctl enable load-realtek-driver.service