I have a multi-boot system with Windows 7, Ubuntu 15.04, and Kubuntu 15.04 installed in that order. At the moment, I think my system boots through Kubuntu's GRUB. My Windows is installed on an NTFS partition (sda2); and all within an extended partition sda2: I have my Kubuntu ext4 (sda7), Ubuntu ext4 (sda6), and swap (sda5) partitions.

How can I properly uninstall Kubuntu leaving behind Windows and Ubuntu?

I don't think I can simply delete my Kubuntu partition using GParted from Ubuntu and run sudo update-grub can I?

  • Correct method is to boot into install you want to keep. Then install its copy of grub to MBR before deleting the one that will not work. sudo grub-install /dev/sda But you should not have to reinstall either. Just use live installer to restore grub. Either manually or with Boot-Repair. help.ubuntu.com/community/Grub2/…
    – oldfred
    Commented Jul 28, 2015 at 17:13

2 Answers 2


Try this:

Boot the computer from Ubuntu.

Open a terminal,

Press Ctrl+Alt+T

Run it:

sudo apt-get update
sudo apt-get install grub-pc grub-pc-bin grub-common grub2-common
sudo grub-mkconfig -o /boot/grub/grub.cfg
sudo grub-install --recheck /dev/sda
sudo gparted

Delete the partition using GParted, close it and continue running:

sudo update-grub
sudo reboot

You can delete the partition using GParted and run sudo update-grub.
But first of all create an Ubuntu distro bootable drive and back up your data - anything can happen.
If sudo update-grub does not work when you run it from the installed Ubuntu then boot from the bootable drive you created and run the command. That works when the latter fails.

  • This did not work. The subsequent boot displayed something like "partition not found". I cannot run sudo update-grub from the bootable USB (some file can't be found - I forget now). Did you read the part where I mentioned that it was Kubuntu's GRUB that I was booting through, and not Ubuntu's? Turns out reinstalling Ubuntu does the job, but a better method would be nice.
    – MadCommy
    Commented Jul 28, 2015 at 16:41

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