Just installed 13.04 on my laptop, had about 2/3 of the 500Gb HDD unused.
When the menu came up for the type of install, I unchecked the top one, BECAUSE it said it would overwrite the whole drive, and I still wanted my Windows operational in a dual boot.
Looked briefly at "Something Else", decided to not bother this time, I usually go that route, and do the partitioning my way with a shared part.
Went "Back" from this choice, and checked the middle two for encrypted, which assured me it would not encrypt existing files.
Huge surprise! Never had this happen before, and I'm furious. I have all the Windows user files externally backed up from a couple of weeks back, but the rather "loaded out to the max" install is gone, EVERYTHING is gone just as if I had specified the "Erase Disk" install option that I so scrupulously avoided!!!
From now on, I must consider even Ubuntu as potentially hostile. I sincerely regret letting that .iso have a shot at my computer; the shot is quite fatal. Nothing in Gparted or file management, or even anything on Hiren's BCD has anything to offer, except to tell me how new the drive now is.
Oh, yeah, don't pop the CD out when it says it has "completed" the install, and wants to re-boot... Kernal panic set in, it won't shut down by itself and leaves a lot of text on the screen instead of shutting down.