Ethernet adapter was disable on Ubuntu 17.04

Here is how to fix this problem.

Edit file /usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf and change it's content from :

[keyfile]
unmanaged-devices=*,except:type:wifi,except:type:wwan

To :

[keyfile]
unmanaged-devices=*,except:type:ethernet,except:type:wifi,except:type:wwan

And then run :

sudo service network-manager restart

That's all.

My Ethernet was also disabled after I upgraded from LTS 16.04 to 16.10 then to 17.04. I was able to resolve by manually doing the following:

sudo ifconfig eth0 up 
sudo dhclient eth0

1. Delete all in /usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf

2. Change [ifupdown] managed=false to true in /etc/NetworkManager/NetworkManager.conf

3. restart with sudo service network-manager restart

When I upgraded to 17.04 this network manager file was blocking my system from automatically managing my devices.

/usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf

Content:

[keyfile]

unmanaged-devices=*,except:type:wifi,except:type:wwan

I commented it all out, rebooted, and everything works fine now. It can also be deleted.

Reference: Network Manager refusing to manage wired interfaces