sudo apt install linux-azure
sudo apt purge linux-virtual
sudo apt autoremove
sudo reboot

uname -a
Linux MyVM 4.13.0-1005-azure #7-Ubuntu SMP Mon Jan 8 21:37:36 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

ethtool -S eth0 | grep vf_
     vf_rx_packets: 510
     vf_rx_bytes: 721043
     vf_tx_packets: 892
     vf_tx_bytes: 200765
     vf_tx_dropped: 0