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I deleted the drive allocated to ubuntu (os other than windows 8.1) and merged with existing drive in wind 8.1.But When I try to boot,it also shows the ubuntu starts menu.After clicking the ubuntu boot menu it shows the some command line interface.such as grub>

How do I remove the ubuntu option permanantly and can reinstall ubuntu?

  • look like you remove it in a wrong way and GRUB bootloader is still as a default bootloader. Since you have Windows there, try to use Windows recovery and do startup repair. – Aizuddin Zali Oct 9 '15 at 8:56
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If it's an EFI-mode boot, you can:

  1. Boot anything you can boot, such as an Ubuntu installation disk in its "try before installing" mode.
  2. Identify the EFI System Partition (ESP). This is normally the first or second partition on the disk, although it can be something else. It's a FAT partition with a "boot flag" set in parted or GParted, or with a type code of EF00 in GPT fdisk (gdisk, sgdisk, or cgdisk).
  3. Mount the ESP.
  4. On the ESP, delete the EFI/ubuntu directory tree.

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