With gpt you need either an efi partition at start of drive for UEFI boot, or a small unformatted bios_grub partition for grub2's boot file. What system is this? Is it a newer system with UEFI? Old XP did not even read gpt drives, but you can use Windows to read gpt drives if a partition is NTFS even if booting in BIOS mode from a different drive. I do not have UEFI but have booted XP from MBR drive with Ubuntu booting from gpt drive. And both systems only boot from MBR(msdos) partitioned systems with BIOS. Ubuntu will boot from gpt drive with BIOS or UEFI. Windows only boots from gpt drives with UEFI. Then you can also have each totally separate with its own boot loader in the MBR, if BIOS booting. If that does not work post link to BootInfo report from prefer to keep each system on separate hard drives if you do have more than one drive. Did you install additional video drivers or make some other changes? Seems like a video issue, or settings of something within your system this: So best to have good backups both for drive failure or corruption you can boot to command line, then Boot-Repair cannot usually fix it, or the most it could do is add a boot-parameter to grub to help. If smaller partition then repairs are quicker or only half of data may need to be restored from that backup. But sometimes that does not work or other tools are required. While drives will fail, more often we see corruption issues where a power failure or abnormal shutdown needs fsck. While videos may be the exception that is ok, I normally do not suggest extremely large partitions that we now can have just because drives have become that large. I see you have one large video partition in sdc1 of 4TB. You use grub-efi for UEFI booting and grub-pc for BIOS booting and grub-efi will add the mount of the efi partition in fstab, so on updates it will update the entries in the efi partition. It then depends on which version of grub you last installed manually or with Boot-Repair. Your fstab shows the mounting of the efi boot partition, so that tells me you have a UEFI boot even though you have grub in MBR and a bios_grub partition. Unless you install completely another install on another drive in BIOS mode should you ever boot in BIOS mode. But you have a UEFI system and need to consistently boot hard drive(s) in UEFI mode. It may be in your case you tried booting from MBR in BIOS mode as it looks like you have that. Invalid arch is usually different versions of grub.
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