You started the installer in UEFI mode, but your installation is in the BIOS
legacy mode.
Booting the installer in BIOS mode should resolve your installation problem.
** Changed in: grub-installer (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1763554
Title:
grub install failed along with ubuntu installation crashing, left
unbootable
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