Umount -f pc can not recognize grub2 [closed]

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I executed umount -a -f / to unmount all devices.after restarting system i can not see ubuntu choice of grub2,i mean grub2 Does not come.i am alone with the bios of dell inspiron 15r . How can i make pc recognize grub2 menu.

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grub configuration and the bootfiles are located in /boot directory. Please state clearly what you want to accomplish. If you have accidently unmounted the root partition then try running your system with a usb bootable linux. and try to repiar it then using a distro cd...