This is more like an installer bug, it crashed due to failure during
grub install.
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https://bugs.launchpad.net/bugs/1401320
Title:
crash during install grub
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You partitioned the disk using GPT, but created neither an EFI system
partition, nor a bios_grub partition. You need one of these depending
on whether you want to boot in bios or efi mode.
** Changed in: grub-installer (Ubuntu)
Status: New = Invalid
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