An old post I know, but it kind of reflects the problems I had installing Sabayon, so I am adding to it.
I installed a 'daily' version with the Xfce desktop about 3 days ago, the experience was dreadful. I have been using Linux for nearly 15 years, have installed hundreds of different distros, but never had issues quite like this.
I installed from a usb key on a correctly md5'd iso. The distro ran perfectly normally whilst I was testing it - read that again carefully, it means what it says - no delays, no freezes, no problems. As soon as I hit the installer all that changed. It appeared to be constantly frozen, you would make a selection and nothing would happen, you would select again and nothing would happen, after several repeats it threw up a warning to the effect that it had crashed and would I like to report the problem or exit. It didn't matter which of these I chose because the result was the same, the warning dialog just kept reappearing until you rebooted and started again.
I went through this process multiple times and was about to give up until I hit on the idea of selecting whatever choice I wanted to make and then going away and making a cup of tea. By the time the kettle had boiled the selection was in place and you could move to the next stage. eventually using this process I got the configuration to a point where it was ready to install, but getting there was a very long and tedious business. The installation itself went at normal speed, it was just getting it ready for install that was so problematic.
I have a high powered laptop and do not use Uefi and I repeat, before starting the installer the distro ran perfectly normally throughout my testing phase.
I have deleted the iso and wiped the usb key so I can't help you any more than that, but I thought you really ought to know how useless the installer was.
Since installing the distro Sabayon been running superbly, I really like it.
Fujitsu Lifebook AH532 laptop. Intel i5 processor, 6Gb ram, Intel HD3000 graphics, Intel Audio/wifi, Mint17, Ubuntu1404, Manjaro, Sabayon, all Xfce4 desktops.