Acer Extensa 215-52 Dual boot: Hard disk partitions not showing up on Zorin OS (Linux) installation

Nitinn
Nitinn Member Posts: 3 New User

I have Acer Extensa 215-52. I want to dual boot it with ubuntu. But my hard disk partitions are not showing while Zorin OS . Only bootable USB is showing as /dev/sda. No Other media is showing. It should show all partitions from hard disk.
I have changed the SATA mode to AHCI also.
secure boot disabled
fast boot disabled
USB created through RUFUS with GPT partition.
Do I need to change anything else in BIOS or other settings? 

Please let me know its urgent. 
Thanks