Is the installer calling the gparted bios_grub partition biosgrub. That would just be the same partition. Grub on gpt partitioned drives needs a unformatted partition of 1 or 2MB.
You can have a 100-300MB partition formatted FAT32 with boot flag (ESP). That would only be used for UEFI boot, but good to have on drive if later you convert that drive to UEFI boot. It is recommended by UEFI to be first on drive and that can be difficult to add once drive has lots of data. If not using it now, make it only 100MB.
For BIOS boot you must have a 1 or 2MB unformatted partition with the bios_grub flag.
Then how you boot installer is how either is used. If you boot installer in UEFI mode the ESP is used. If you boot installer in BIOS mode, then the bios_grub partition is used.
This is all the same as I posted in post #8. I always create ESP, bios_grub, / (root) & swap with gparted and using gpt. And never had any issues.
Partitions should end up like mine:
Code:
Partition Start Sector End Sector # of Sectors System
/dev/sda1 2,048 1,026,047 1,024,000 EFI System partition
/dev/sda2 1,026,048 1,030,143 4,096 BIOS Boot partition
/dev/sda3 1,030,144 52,229,362 51,199,219 Data partition (Linux)
/dev/sda4 246,163,456 250,068,991 3,905,536 Swap partition (Linux)
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