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Yesterday I installed Kali linux in macbook air having macos (sierra).today I downloaded Catalina through appstore . It downloads Catalina file around 7gb and to install it reboots MAGIC While rebooting it enters into Linux grub option. Then I tried to reboot again with option button It show Macintosh disk and I clicked it.then Normal sierra opened What about Catalina os . I have files of Catalina

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the mac reboots at the upgrade installation, some installation routines happens after this reboot. With re-booting into grub you canceled the installtion. Deacitvate grub to do a full installtion with maybe needed firmware upgrade...

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