Cinnamon 17.3 Grub Failure on Re-Installation

How can I force Mint 17.3 Cinnamon to ignore a grub error to complete the installation? Or how can I fix the grub lock?

I am attempting to reinstall Mint Cinnamon 17.3 on a Microsoft Surface 2 Pro with Windows 10.

The instillation cancels with:

The 'grub-efi-amd64 signed' package failed to install into /target/. Without the GRUB boot loader, the installed system will not boot."

Windows 10 boots correctly. And I have deleted the ubuntu folder from the efi partition. I used easyBCD to check that the boot record is good. And the problem persisted after disabling hibeation in windows.

Is there a way to make the install ignore the error? If it completely installs, I think I might be able to patch grub separately.

I want to install from the iso because the install is customized for my machine type. I used the iso from https://www.reddit.com/r/SurfaceLinux/Idea/3w8du2/outofthebox_support_for_linux_mint_173_cinnamon/

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