So I have a UEFI system from 2013, fast boot is disabled and all that, and secure boot is turned off. I just burned a fresh copy of Boot Repair Disk since I don't have a USB thumb drive, but my system doesn't detect the disk drive as being bootable. Nothing in the EFI firmware shows the optical disk drive as a boot option before I even get anything up. I opened up the disk in Windows Explorer to see that the disk does have an EFI folder and EFI boot files. So what's the problem?
You'll need to set your BIOS back to UEFI to boot your normal operating systems.
If for some reason that doesn't allow you to boot normally, then you'll need to run boot-repair in UEFI mode.
- make sure your BIOS is set back to UEFI
- boot a Ubuntu Live DVD in
- make sure that you're connected to the Internet
- start the
terminalapplication from the Unity launcher
in the terminal, type:
sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install -y boot-repair
Perform the recommended repair.