Recently I wiped OS X completely from my Macbook Air and installed Ubuntu 13.04 alone. This worked great because it even booted automatically into Ubuntu without needing to hold any keys.
Today, I ran the Ubuntu software update and apparently as the kernel and other things were updated, now it will boot directly into OS X recovery. Is there a way to fix this and boot into Ubuntu automatically again? I only have Ubuntu installed on this machine and I intend to keep it this way.
My Macbook Air is a 13' model 4,2 (late 2011)
Update: If I hold the Option key, I can choose the only HDD partition that is present and boot Ubuntu, but I'd like this to happen automatically.