No option to dual boot Zorin

I have a mid-2010 Mac desktop, 1 Tb HD, 12 Gb Ram. Installed Zorin on half the drive, could boot to Mac High Sierra or Zorin. Have some concerns about Zorin, wanted to try Linux Mint. Booted, tried live, decided to install. Installer said could choose between Zorin and Mint. Not so. When I reboot, I can choose between hard drive (Mac OS) and EFI boot which boots Linux Mint. How can I get the option of choosing between Mint and Zorin? I don't care about the Mac OS, will never use.

Thanks for any help.

Was Zorin OS installed as MBR boot?

Hmmm, I really don't know. How can I tell?

A full guide may be better:

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OK, thanks. I'll take a look.

Does this help?
Model: ATA WDC WD1001FALS-4 (scsi)
Disk /dev/sda: 1000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number Start End Size File system Name Flags
1 20.5kB 210MB 210MB fat32 EFI System Partition boot, esp
2 210MB 501GB 500GB Customer
3 501GB 501GB 650MB hfs+
4 501GB 502GB 512MB fat32 boot, esp
5 502GB 526GB 24.6GB linux-swap(v1) swap
6 526GB 834GB 308GB ext4
7 834GB 1000GB 166GB ext4

Says gpt
If I can safely delete the Mac partition, that would be great. I'll never use it again.

You certainly can do that if you want to.

You may need to boot a LiveUSB of Zorin OS and reinstall Grub.

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I'll have to read up on that. :slight_smile:

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