I'm trying to install Ubuntu on an acer aspire 3. I boot the installer from a USB drive and things go fine until I need to make a new partition for Ubuntu. Here it seems like the installer can't detect the hard drive and the only available drive is the USB stick. See image 
This is what it looks like in GParted
After some googling I found that I had to change the SATA mode to AHCI from the BIOS setup. I did this but it doesn't seem to have helped. I see that this post describes almost exactly the same problem except with an earlier version of Ubuntu, but the question there has not been answered. Any ideas here?
