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 

Install x11vnc on xubuntu 16.04 for remote access

Tight VNC server opens new session, but if you need to connect to active session(like in teamviewer when user see what you are doing) I suggest to install x11vnc.
Installation process as follows:

sudo apt-get install x11vnc -y

next - specify password for remote connections:

sudo x11vnc -storepasswd /etc/x11vnc.pass

now create service unit file:

sudo touch /lib/systemd/system/x11vnc.service

and open it in editor:

sudo nano /lib/systemd/system/x11vnc.service

paste to file:

[Unit] 
Description=Start x11vnc at startup. 
After=multi-user.target
[Service] 
Type=simple 
ExecStart=/usr/bin/x11vnc -auth guess -forever -loop -noxdamage -repeat -rfbauth /etc/x11vnc.pass -rfbport 5900 -shared 
[Install] 
WantedBy=multi-user.target

 now configure service:

sudo systemctl enable x11vnc.service  
sudo systemctl daemon-reload

now reboot and try to connect to x11vnc.

Xubuntu 14.04 how to enable remote access.

1. Install vino vnc server:

sudo apt-get install vino-server

2. run vino preferences:

suod vino-preferences

3. configure preferences:

4. Update the firewall:

sudo ufw allow from any to any port 5600

5. Update the encryption requirements for remote access:

sudo apt-get install dconf-editor

dconf-editor

6. Disable require encryption:

7. Update the session manager via enabling Settings->Session and startup->Application autostart->Desktop Sharing:

8. Restart computer and try to connect vith any vnc client.