I am new to Linux and I am trying to install Ubuntu on my mac book pro without deleting the existing mac OS. I am roughly following this tutorial (https://www.lifewire.com/dual-boot-linux-and-mac-os-4125733) to install Ubuntu 17.10 and I have installed rEFInd from my mac OS. When I try to install Ubuntu on my computer, I select the partition I already created with the ext04 file system and for the boot loader option I have tried multiple options but they all give the following error "the grub-efi-amd64-signed package failed to install into /target/. Without the grub boot loader, the installed system will not boot."
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Firstly, make sure to back up your data. You are playing with drive partition tables and may accidentally delete or format your Mac partition.
If your mbp is one of the newer ones, there are some issues. I have no experience with that, but there are details at https://github.com/chisNaN/ubuntu-on-macbook12 and https://gist.github.com/roadrunner2/1289542a748d9a104e7baec6a92f9cd7#file-0-linux-on-mbp-late-2016-md
As far as grub goes, make sure you are installing in EFI mode. I've had the best luck by installing grub itself to the EFI partition. You'll want to configure Ubuntu to mount your EFI as /boot/efi, and to install grub there. If the installer doesn't give you that option, you are probably not in EFI mode.
