[ubuntu] Accidently overwrites mac

Hi,

I dual booted my mac with ubuntu using a tool called reFInd, But after finishing the process, I can't access my mac partition again and ubuntu takes up all the hard disk spaces on my mac.
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And after shutting down or restarting, it goes straight to ubuntu without showing the reFInd menu and I can't access the macOS.

Any help is really appreciated because my backup isn't up to date and I'm yet to backup some important files on the mac partition.

Thanks.