I cancelled the install as the title sais. The problem is now I can't boot into ubuntu, all it shows is a flashing underscore on a black background. I've tried resuming the download from the same USB, but it won't work. I've tried booting from ubuntu desktop live from another USB, but it tries booting using the hard. Also tried entering BIOS, but I've found out that you can't enter BIOS if you install UEFI. My question is how can I format the hard disk so that I start from scratch? Or if there is any other method of either resuming the install or start from scratch. The server is a DELL PowerEdge T20.