NTFS signature is missing. FAILED Failed to startup volume: Invalid argument Error opening '/dev/sda': Read-only file system

I am trying to install linux ubuntu on my acer nitro 5 laptop but could not install.When i run the following command sudo ntfsfix /dev/sda It gives:Mounting volume... Error opening '/dev/sda' read-writeNTFS signature is missing.FAILEDAttempting to correct errors... Error opening '/dev/sda' read-writeNTFS signature is missing.FAILEDFailed to startup volume: Invalid argumentError opening '/dev/sda': Read-only file systemVolume is corrupt. You should run chkdsk.How to fix it