Ubuntu updating connection failed nm ifupdown connection c 82
The bug is annoying and silly that something so basic would escape the development team.
Any way there are two solutions one uses the command line and the second one the GUI.
Any one connection can only have only of the states not both.
The eth1 is just a name to make it easier for the user to know which way he's connected through to the network/Internet.
A USB stick would likely be the easiest method for this.