My home server, which is a laptop with an external USB drive, shut itself down after a series of ethernet and USB errors over a 2-hour interval. The log files show nothing unusual with ethernet or USB in the preceding several days. Here are selected lines from the messages log file. (Similar entries appear in other log files.)
Thinkpad T432, Kubuntu 14.04, Linux 3.13.0-34-generic
I left for vacations, came back, and cannot use my ethernet plug anymore. It is crucial for me at work. I can connect with Windows. I cannot connect with Linux, either at home or at work. Wireless works fine.
I did a first time install of Ubuntu 11.10 using Wubi and the ethernet connection on my laptop. (so I know that the ethernet interface is working and connected correctly). I finished the install and booted up Ubuntu. The wireless connection works find, but I am not able to get the wired connection to work.