I currently use Ubuntu 10.04, and I want to upgrade it to version 12.04 (and then, maybe, to 13.04). I can do it via Upgrade Manager, but I'm worried that my important files (which are in the home folder) could be removed. I also have many files (circa 50 GB) on another hard disk (it's a different disk than the one on which I have installed Ubuntu) - are they safe?
Last but not least, I've installed Windows XP (so I can choose my system via grub) and I want to know whether it will be still there, or will it be removed?