Ubuntu installation: No root file system is defined.

On a new SSD drive laptop, I got this error on the Installation type step I could not manage the disk because when clicking the continue button the window freezed, I could only see dev/sda on the drop-down.

The steps I took to solve this were:

• Get into Windows safe mode by opening CMD as admin and entered command bcdedit /set safeboot minimal
• Restart and boot into BIOS
• Changed SATA operation mode from RSD (I think this was the “RAID” I was seeing while searching for a solution)to AHCI

I have also changed the windows Power options

When power button is pressed: shutdown.

That solved my issue.