Changing Boot Partition in Mac: A Step-by-Step Guide

When setting up a dual-boot system with multiple operating systems, it's essential to ensure that each partition is correctly configured to boot successfully. In this article, we'll discuss how to change the boot partition on your Mac, specifically when dealing with an NVMe SSD and a traditional hard drive.

During installation, it's possible to set up your partitions incorrectly, which can cause issues when trying to boot one of the operating systems. The first step in resolving this issue is to check the content of your `/etc/fstab` file, which shows the current mount settings for your system. In our case, we see that `/boot/efi` was previously mounted on `/dev/nvme0n1p1`.

To fix the issue, you'll need to change the mount settings so that `/dev/nvme0n1p1` is used as the mount point for `/boot/efi`, and `/dev/nvme0n1p2` is used as the root partition (`/`). This will ensure that your partitions are correctly configured to match how they were set up during installation.

Another issue you may encounter when trying to boot one of your operating systems is a complaint from Grub about not being able to find a specific partition. In our case, we're seeing an error message complaining about the '22ac8da-d6' partition. This is often caused by the partition containing the necessary files not being mounted correctly.

To resolve this issue, you can use the `gparted` tool to check the status of your partitions. If you find that a partition is not mounted correctly, you'll need to adjust the mount settings accordingly.

In our case, we have two Ubuntu installations: one on the SSD (nvme0n1p1) and one on the hard drive (sda1). After upgrading to 17.10, the Ubuntu installation on the SSD stopped booting, complaining about not being able to find the file `/boot/vmlinuz-4.13.0-041300-generic`, even though the files are present.

By following these steps and adjusting your mount settings accordingly, you should be able to resolve any issues with your boot partition and get your system up and running again. Remember to always backup your important data before making any changes to your system configuration.

Change boot partition mac