Xubuntu. No network with Intel I219-V ethernet card

xubuntu 16.04 does not recognize Intel I219-V Ethernet card.
solution is to download driver sources from Intel Downloads Site then unpack sources to your home catalog. Find file nvm.c file and open it in editor.
Find function e1000e_validate_nvm_checksum_generic(struct e1000_hw *hw) and comment body as shown:

s32 e1000e_validate_nvm_checksum_generic(struct e1000_hw *hw)
{

    /*
s32 ret_val;
u16 checksum = 0;
u16 i, nvm_data;

for (i = 0; i < (NVM_CHECKSUM_REG + 1); i++)

{
    ret_val = e1000_read_nvm(hw, i, 1, &nvm_data);

   if (ret_val)

  {
    e_dbg("NVM Read Error\n");
    return ret_val;
   }
checksum += nvm_data;
}

if (checksum != (u16)NVM_SUM) {
  e_dbg("NVM Checksum Invalid\n");
  return -E1000_ERR_NVM;
}

    */
return 0;

}

after that, build and install new module:

make

sudo rmmod e1000e
sudo make install
sudo modprobe e1000e

after that Ethernet should work.

This fix found on: https://unix.stackexchange.com/a/295052/23506