"Activation of network connection failed" error after connecting ethernet cable to STM32MP157x-DK2

[embeddedbro]

I am following getting started guide of this board STM32MP157x-DK2

 

https://wiki.st.com/stm32mpu/wiki/Getting_started/STM32MP1_boards/STM32MP157x-DK2/Develop_on_Arm%C2%AE_Cortex%C2%AE-A7/Create_a_simple_hello-world_application

 

When I am connecting an ethernet cable, after a while, this error message pops again and again..  "Activation of network connection failed" on Ubuntu machine. I can't see the IP address so I am stuck at this step. 

4. Deploy and execute

scp gtk_hello_world root@<board ip address>:/usr/local

[embeddedbro]

Use the IP address displayed on the screen of default demo program. 

it worked after that.