'the 'grub-efi-amd64-signed' package failed to install into /target/' during Linux Mint installation on an iMac I have a Mid 2007 iMac, I've installed rEfind on the mac and the Linux Mint (Cinnamon 17.3) installer on an USB thumb drive .

rEfind sees the USB thumb drive, sees grub installed on the key, I boot from it and start to install Linux Mint, at a certain point I get this error: 'the 'grub-efi-amd64-signed' package failed to install into /target/'.

I manually set the partition table:
sda4 / k gb 
sda5 swap 4096 mb

The iMac has a Core 2 Duo 2.0 Ghz, 3 GB RAM, and a NVDIA card.

I'll try again using the last UNebootin version, ad some different Linux distro (Xubuntu, Ubuntu, Lubuntu), but I'd like to know what issue could I have.
Took me weeks, but finally solved it for my case.

My install would go well, but the installation of grub would fail with the same message because of corrupted data in the EFI partition.

Fastest fix was to run a windows chkdsk to fix the partition, then the next install went fine.