MacBook Air

Erase computer for selling

I tried to erase my MacBook air to sell when I tried to reinstall OS X it failed said

No packages were eligible for install. Contact the software manufacturer for assistance

Quit the installer to restart your computer and try again

I then found advise about changing the date which seamed to work with Yosmite installed and not El Capitan, until I tried to reinstall files from external drive. Would not let me sign into my iCloud account or open any file on my hard drive. I tried to download El Captian from my purchase list in apple store and then computer crashed altogether. I then got the this message see pictures

I tried to go into Os x utilities again to erase drive but I am not getting

unmounting disk couldn't unmount disk operation failed

I don't know what to do please helpErase computer for selling

Erase computer for selling

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