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While UEFI WBM can practically boot Windows on an MBR drive, I'm pretty sure this isn't the case here. More/st likely it is a UEFI/CSM-mixed dual-boot setup. (And even if an alternative set of WBM was installed to this assumed-ESP, the original set is likely still intact, since the "Active" System Reserved partition is still there.) So unless it is actually a pure CSM/BIOS setup, and the MBR was written with BIOS grub's boot code or so, the OP can probably even just delete the unwanted partitions from within the Ubuntu installation with fdisk, reboot, and voila.)
– Tom Yan
Commented Apr 28 at 19:53
I run the DiskGenius, it seems the FAT32 is in the Ubuntu partition of 50.8Gb (see updated post). Can I just delete the Ubuntu partition and keeping the 512Mb of the 50.8Gb? And move the 50.3Gb Ubuntu partition to C:?
– User981636
Commented Apr 29 at 19:00
1

The 50.8 GB (not Gb) partition is ext4 and can be deleted, and combined with the 512 MB (not Mb) partition, without much worry. You will also have to change booting so that grub will no longer show the deleted Ubuntu option. [BTW, "b" for bit, 1/8 "B", byte.]
– DrMoishe Pippik
Commented Apr 29 at 19:44
But I aim to add the 50.3GB (ext4) to the C drive of 186GB, not to the 512MB FAT32. Is that possible if I just delete the 50.3GB?
– User981636
Commented Apr 29 at 20:52

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