I have linux mint which I don`t need, besides my ubuntu. It resides on bootable partition. How do I remove it without destroying mbr?

  1. Boot to ubuntu.
  2. Format your bootable partition with gparted.
  3. In gparted set the bootable flag again to the formatted partition.
  4. Run sudo update-grub to reinstall grub.

Explanation: As there is no mint, grub won't detect the kernel, but it will reinstall itself to mbr with ubuntu kernel.

If you messed up everything and want to correct things. Boot a live cd and install boot-repair

    sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update
    sudo apt-get install -y boot-repair && sudo boot-repair



You simply need to re-install grub. Boot Ubuntu and run

sudo grub-install /dev/sda

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