Re: Install xubuntu 14.04 over ubuntu 13.10
If don't need any of your data. Yup you choose Something else, select your Ubuntu 13.10 drive, double click on it, set it to / and format, choose OK, select where you'd like your bootloader to go (I don't put it on /dev/sda, I put it on the drive I use for (K,Ed,X)Ubuntu where my system uses EFI (so my drive is /dev/sda6 for my Xubuntu installation).
If you need your data, back it up, then go from what I said above.
Where's [slooksterpsv] been? - I had Catastrophic partition alignment failure. I lost 90%+ of my data, and just now got it back fixed and working.