I had this issue on my Vaio P. When the Ubuntu splash screen starts up hit F6, then F6 again for more options. I randomly disabled the options there and got it to work. I didn't take the time to figure out which choice was the important one.
There are other problems with 10.10 on Vaio P, unfortunately. The synaptics driver loads during the install screen for the touchpad and stick, but once installed it does not show up as an input device at all!
Also, installing PPA source and poulsbo drivers causes X to fail to start.
I don't have a lot of time or motivation to troubleshoot this...
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