I am currently trying to get Grub back. I have tried everything from reinstalling, to boot-repair, and even super boot manager. Nothing seems to work.
I have created a log with boot-repair here.
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Ubiquity (the Ubuntu installer) installed Ubuntu in the wrong mode. You were affected by this bug: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1050940
It also removed the
boot flag by mistake.