Ubuntu 16.04: Wired coection not working, "eth0" renamed to "eno1". Can't coect

Hi,

Yesterday I lost my inteet coection after rebooting my Ubuntu 16.04 installation. Now when Ubuntu boots, it searches for a network for a couple of minutes, then states "Coection established" but I can't get online or communicate (send ping requests, for instance) to anyone.
I deleted the etheet network, hoping it would re-initialize if I re-added it. When I click the network manager icon, the "Etheet Network" is greyed out (so I can't enable it). There is a new entry now, called "Auto Etheet" but that one doesn't work (same symptoms as I mentioned earlier).
If I try to add a new etheet network coection, the "eth0" is gone from the list of devices. Instead, I now have a "eno1" entry which I've never seen before. It might be the same device that is renamed but I don't know.
My /etc/network/interfaces file contains

auto lo
iface lo inet loopback

dmesg | grep "eth0"
eth0: Intel(R) PRO/1000 Network Coection
eth0: Mac: 11, PHY 12, PBA No: FFFFFF-0FF
eno1: renamed from eth0