Yesterday I lost my internet connection after rebooting my Ubuntu 16.04 installation. Now when Ubuntu boots, it searches for a network for a couple of minutes, then states "Connection established" but I can't get online or communicate (send ping requests, for instance) to anyone.
I deleted the ethernet network, hoping it would re-initialize if I re-added it. When I click the network manager icon, the "Ethernet Network" is greyed out (so I can't enable it). There is a new entry now, called "Auto Ethernet" but that one doesn't work (same symptoms as I mentioned earlier).
If I try to add a new ethernet network connection, 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
Is there some way of re-installing my network manager and/or ethernet driver without network connection? Or am going to have to reinstall Ubuntu?