Then you will need to create an EFI system partition on that drive.
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https://bugs.launchpad.net/bugs/1578677
Title:
Installation failed to istall grub on manually edited gpt
To manage
: [Bug 1578677] Re: Installation failed to istall grub on manually
edited gpt
Your disk is currently partitioned to boot in bios mode, but you booted
the 16.04 installer in EFI mode. A warning message prompted you that
this could be a problem and recommended performing a bios mode install
instead, b
Your disk is currently partitioned to boot in bios mode, but you booted
the 16.04 installer in EFI mode. A warning message prompted you that
this could be a problem and recommended performing a bios mode install
instead, but you chose not to. You either need to perform the bios mode
install, or