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You can convert an existing installation of Ubuntu from legacy to UEFI and vice versa. You need to reinstall GRUB to the device hosting grub, in my case this is /dev/nvme0n1 Legacy to UEFI sudo grub-install --boot-directory=/boot --bootloader-id=ubuntu --target=x86_64-efi --efi-directory=/boot/efi /dev/nvme0n1 UEFI to Legacy sudo grub-install --boot-...


I had to rise videomemory and it worked!

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