On 01/01/15 21:59, Chris Green wrote:

I am trying to use a USB-ethernet adapter to give me a second ethernet connection to an xubuntu 14.04 system.

It's detected OK and drivers are loaded but Network Manager goes into a loop repeatedly saying the connection has been established and then saying it's disconnected. It cycles once very few seconds, say 10 seconds or so.

It's set up with a static IP on a different subnet from the 'proper' ethernet.

Does anyone have any idea what might be wrong?

No, but I'd try setting it up to work using config files and/or command line first, and checking log files, dmesg etc for errors. I think Network manager used to have a reputation of being a bit rubbish, but it's got better recently.

Steve