- Boot into Linux and log into admin level account
- Open Terminal and type the following in order to
install and run Boot Repair:
- “
sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt update
- “
sudo apt install -y boot-repair
&& boot-repair”
- Follow prompts to reinstall grub to the partition where your Linux OS is installed – probably the fourth (nvme0n1p4)
- Close out Terminal and open a new console and
type:
- “
sudo add-apt-repository ppa:danielrichter2007/grub-customizer” - Hit “Enter” and type:
- “
sudo apt-get update”
- “
- Hit “Enter” and type:
- “
sudo apt install grub-customizer”
- “
- “
- A new "Grub-Customizer" snap will
appear in your “Activities” menu; open it
- Configure grub to bypass the menu and to boot Ubuntu automatically
- Be sure to click “Save” when done
- Go back to Terminal and type:
- “
sudo gdisk /dev/nvme0n1” and hit “Enter” - Verify the MBR is set to “protective;” if not, follow Step 6
- “
NOTE: Any time you change grub, you should determine whether your GPT has been converted back to a “hybrid” MBR; if so, complete Step 6 again, but you don’t need to reinstall gdisk.
ALSO NOTE: If you have chromeOS installed already, this step may rename the “boot” folder on the chromeOS partition to “boot_rm”. Just rename it back to “boot” to fix chromeOS boot loader.
Bingo! You know have a triple-booting Mac, but it’s not a Think quadratic. Mac until it can boot chromeOS as well! The installation process depends on the Mac model you have.