After normal system start no network is detected. If I plug off ethernet cable and insert usb wi-fi, no new device is detected either.
However if I run system in recovery mode and enable networking in recovery menu, the internet works fine. The problem is I must do it every single time I start my computer.
ifconfig
sudo lshw -C network
prints this: http://pastebin.com/wcJztG9R
In 2nd case I can see "*-network DISABLED". Tried to enable it in network menu, but nothing is detected.
Seems strange to me. I do not remember changing any config files or network settings. I just restarted my PC and network stopped working.
I use Ubuntu 14.0.4 LTS