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I have a HP ENVY 15 j037-el with Ubuntu 15.04 installed alongside Ubuntu 16.10. I would like to delete the 15.04 partition without risking to break the booting process: that happened me once and I wouldn't like to repeat the dreadful experience of fixing the grub via command line again.

The partitions I can see with disks are:

  1. /dev/sda1, EFI system, FAT32, size 537 MB
  2. /dev/sda4, root linux partition (x86_64), Ext4 (v 1.0), size 730 GB
  3. /dev/sda2, linux filesystem, Ext4 (v 1.0), size 257 GB
  4. /dev/sda3, Swap linux, Swap (v 1), 13 GB

Ubuntu 15.04 is installed on /dev/sda4 and Ubuntu 16.10 on /dev/sda2. Thank you for your help.

Edit: I already followed the instructions given for question this question, specifically the part about the OS-Uninstaller, but as I already wrote, I had to manually fix the grub to get my laptop to boot again. I would like to know how I can safely remove the partition without risking to compromise boot.

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Giulio Vandin
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  • Excuse me, but I am not asking how to completely wipe out Ubuntu in order to use Windows. I am asking how to safely remove one Ubuntu partition without compromising the functioning of the other one. Thanks. – Giulio Vandin Nov 28 '16 at 15:44
  • Where did you run the disks command? On your 16.10 or 15.10? – Tony Lancer Nov 28 '16 at 16:03
  • I run it from 16.10 – Giulio Vandin Nov 28 '16 at 16:06
  • Check /EFI/ubuntu/grub.cfg. It should refer to the newer install by UUID and grub device like hd0,gpt2. cat /boot/efi/EFI/ubuntu/grub.cfg If not allowed to view, it may still have permissions set in fstab to 0077. You then can use live installer to view or change permissions. Boot-Repair auto changes permissions as it has to edit ESP - efi system partition. – oldfred Nov 28 '16 at 17:14

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