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I had a dual booted Windows 10 and Ubuntu 18.04 machine.

Last month I decided to uninstall and reinstall ubuntu due to some reasons. I deleted the disk ubuntu partition entirely and I also deleted grub. But somehow when I restarted my computer I was still seeing the grub console. To get out of that I had to type in exit three times to boot into Windows. I followed a guide and tried installing Ubuntu using Unetbootin but I couldn't. On top of that now I couldn't even boot into Windows. Instead, I got an error which said I corrupted the hard drive. Then I installed Windows 8(with a cd) on my machine to access Windows 10. So now I have Windows 8 and Windows 10 on my machine. During boot, I get the windows bootloader screen with 3 options --> Windows 10, Windows 8, Unetbootin.

Now I want too install Ubuntu 18.04 the right way and uninstall Windows 8 from my pc but keep Windows 10 and Ubuntu 18 in dual-boot. Please help me. I am a complete newbie to Ubuntu and Linux. Thank you very much.

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  • If you have some data to save do it.

  • You have already deleted Ubuntu partition and you don't want Windows either, so no problem.

  • Download Ubuntu ISO (and see other options) from here.

  • Make a bootable USB (see here) or DVD (see Here).

  • Boot from USB or DVD by selecting the option by pressing F8 or F12. For other kind of computers see here.

  • When asked choose 'Something else'.

  • When asked choose the partition to install. So on..

  • when completed reboot.

  • Open gparted and delete Windows 8/10 partitions.

  • Run sudo update-grub

  • Done.

  • I forgot to mention-- I want to keep Windows 10 in dual boot with Ubuntu 18. Edited that in now. – Aditya Medhe Nov 25 '18 at 17:10
  • Delete only Windows 8 partition. Don't delete Windows 10 partition. – Vijay Nov 25 '18 at 17:13

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