My Ubuntu 16.04 system can connect to the internet over WIFI, however, fails over the wired network.
I use the secure campus network, so every I connect I need to enter my username and password on an authentication/login page. But when I ping the IP address of the login page over the wired network, it doesn't respond.
I have Windows 10 and Ubuntu on my computer, and I have disabled the "Wake On Line" function of Windows.
PS - I accidentally uninstalled/deleted Python 2.7 in Ubuntu several days ago. Although I have since reinstalled it, I think the network problem might be caused by the Python2.7, cause many dependencies were deleted and I'm not sure if I reinstalled all of them.