Legacy Boot Ubuntu 21.04

Did my regular Ubuntu install with a 1 MB unformatted partition at the beginning of the hard drive with a GPT partition table. The 1 MB partition should have the flag bios_grub.

After the regular install, I ran

grub-install --target=i386-pc /dev/vda

Then I boot up in both secure UEFI mode and a legacy boot using the MBR format.

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