So I have been running Ubuntu server 12.04.1 LTS for about 2 months now and everything has been working fine, but this morning I turned on the server and it got stuck on the waiting for network configuration part then just booted without network. I was wondering if anyone knows what might've happened to cause this. The last thing I did was turn it off using the poweroff command instead of shutdown but that's really all I can think of. So does anyone know?