Once it gets to this screen it hangs/doesn't go anywhere. It's a 64-bit installation, I'm not sure what to do. I've tried installing various ways but I always get the same results. What other information do you need?
I fixed the problem. For some reason the install wasn't quite working while downloading updates via wifi. Once I had plugged in the ethernet cable and installed ubuntu this way it installed correctly and booted correctly. Your links lead me to this resolution, so thanks!