20.10 Installer not recognizing Win 10 : No OS installed. No fastboot, EFI enabled,

Question

                        *edited since oldfred's comment*

Trying to dual boot

Asus G74Sx

 - EFI Enabled
 - No fast boot option

Upgraded from Win 7 to Win 10

 root@ubuntu-mate:/home/ubuntu-mate# fdisk -l
[... loops ]
Disk /dev/sda: 256.17 GiB, 275064201216 bytes, 537234768 sectors
 Disk model: Crucial_CT275MX3
 Units: sectors of 1 * 512 = 512 bytes
 Sector size (logical/physical): 512 bytes / 512 bytes
 I/O size (minimum/optimal): 512 bytes / 512 bytes
 Disklabel type: dos
 Disk identifier: 0x1db352ee
Device     Boot     Start       End   Sectors   Size Id Type
 /dev/sda1  *         2048   1026047   1024000   500M  7 HPFS/NTFS/exFAT
 /dev/sda2         1026048 535446605 534420558 254.8G  7 HPFS/NTFS/exFAT
 /dev/sda3       535447552 537229311   1781760   870M 27 Hidden NTFS WinRE