I had Ubuntu 14.04 installed with a Windows 7 dual boot. Now, I've just replaced W7 by Windows 8, but the Ubuntu partition has disappeared! Running fdisk -l doesn't show /dev/sda5 (which was the Ubuntu partition), if I access to Gparted, it shows the Ubuntu partition as "empty space" and from Windows 8's device manager, this partition also appears as empty space! WTF has happened here? Has the partition been actually erased?