Windows USB EFI boot files. Ask Question 3. My Motherboard certainly supports EFI boot. When inserting my flash drive, I get two options for boot, one bios and one UEFI. Also, I've installed Win8.1 on a GPT disk, as well as a previous win7 install, which I seem to have forgotten how I managed to make it work. Autorun.inf, setup.exe.
I have recently bought a laptop with windows 8 (EFI) installed. I thought I'd be able to handle installing 12.04.2 relatively easily - how wrong could I be? Using a live-usb I made using startup disk creator on ubuntu with a 64 bit.iso file.I First tried to install ubuntu in legacy mode without a boot partition which needless to say didn't work.I then reinstalled ubuntu with the boot partition, still using legacy. This time I managed to get the grub menu to show up but I only had the choice of booting into Ubuntu. (unless I told it to boot in EFI mode and then it only booted windows).I tried boot-repair both times and that didn't help things at all.
I now realise I can't boot ubuntu in legacy mode if windows is booting in EFI. So I need to boot from the live-usb in EFI mode. But when I enable EFI mode and boot from USB FLASH DRIVE it says: FLASH DRIVE HAS BEEN BLOCKED BY THE CURRENT SECURITY POLICY. (or something to that effect) Is there a problem with the way I made the live-usb?
How am I supposed to boot from the live-usb in EFI mode if I get the error message each time? I realise lots of people are asking these sorts of questions at the moment, but I've been looking for a while and I haven't found any solutions that work.:/ Thanks for your help! The Ubuntu 12.04.2 64 bit or the Ubuntu 12.10 64 bit should both be capable of being booted on a machine with secure boot turned on. If there are problems, it may be the fault of the machine - this is a new area and the vendors are still working things out. For instance, Toshiba's got a firmware update (6.60) to straighten out a key/database problem in Jan 2013. Check your vendor for the latest firmware. There may be other problems with getting the install to work, usually a result of getting the EFI directory files messed up.
![Exe Exe](/uploads/1/2/5/6/125646620/896847443.jpg)
The first thing you should do after successfully booting the live media is to back up the files in /boot/efi (this set will boot Windows). After the install, back them up again to another location (this set should boot Ubuntu). Boot-repair may fix problems with these files, but some problems are not fixable. For instance, grub may successfully boot Ubuntu, but fail to boot windows, even with all the correct commands. You will need to ensure first you even have the correct commands since you did the MBR change.
![Efi flash stick Efi flash stick](/uploads/1/2/5/6/125646620/937803369.png)
For non-fixable problems, fall back to a second boot device with it's own copy of the EFI partition and files. That way, you can boot Windows off one set, and Ubuntu off the other.