How to safely remove dual boot Linux

Hi There,

Thanks for your input.

rEFIind never installed properly, it never appeared on the "Startup Disk" section in system preferences, so I'm not sure removing it will achieve anything. But I believe that's a side issue...

I did think of just deleting the Ubuntu partition. But the issue is at the moment is I think it's trying to boot into that partition every time I reboot the Mac. That's why I need to press Option and select the normal Mac OS.

So what happens if I delete the partition that the boot manager is attempting to boot into as default? I don't want to make things any worse than they are....

Thanks.

The "Startup Disk" only has "Fusion macOs, 10.13.6" in there, grayed out. So I don't have a way to change the default boot disk unfortunately.

But if I just reboot normally, it doesn't actually reboot into this macOS system. It tries (I think) to reboot into Ubuntu, but it doesn't actually work, it just kind of hangs.... so who knows really what it's trying to boot in, or whether the efi is just screwed up now?

Yes. I am in MacOS. The "Startup Disk" *only* has "Fusion macOs, 10.13.6", nothing else.

And yes, booting into the other partition doesn't work now. It just sits there. It worked well at the start when I first created the Ubuntu partition and installed it.

I believe it's when I tried to install rEFInd that it all stopped working. But I don't have any experience in dealing with boot records to have any idea how to fix it, or diagnose it.

Thanks for your help. I'll back up and give it a go 🙂