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@ActionParsnip
I was too happy too soon :( rEFInd worked just for a few days.
I got the following result inserting your commandline:
...

Hello everybody,

In the meanwhile I'm using rEFInd bootloader. After trying many different things in terminal, without the success I hoped for, i found rEFInd on SourceForge.net.

I downloaded...

Hello ActionParsnip,

I also tried your commandline, but got the following error-message:

https://ubuntuforums.org/attachment.php?attachmentid=289185&stc=1

Again I restarted my iMac, but...

Hello grahammechanical,

When I first installed Ubuntu, I didn't get the Grub boot menu.

I used your commandline and got the following result:
...

Hy everybody,

I just installed Ubuntu 20.04 in dual boot on my iMac 27" mid 2011 (Mac OS High Sierra). But now it always automatically starts up in Ubuntu, unless I hit my option key, then I can...