I installed fresh Ubuntu and then Kali. Installed Ubuntu with "/", "/home" and Swap partition. Left unallocated space for Kali. After Ubuntu, I installed Kali in similar way as above. Kali was recognizing Swap of Ubuntu but I created a new one for this.

I see Ubuntu is using two swap now.

$ swapon
/dev/sda3 partition 46.6G   0B   -1
/dev/sda7 partition   28G   0B   -2

Kali is also showing two swap in use. How to separate it?

Also, Kali has given warning for grub/UEFI/Boot loader at the end of installation. Don't remember exactly, but I can see Kali has overtaken grub. Both, Ubuntu and Kali, can be selected at boot time. So, no problem here.

I see /etc/fstab of Kali is having two swap entries. But Ubuntu's /etc/fstab is having only one entry. I removed one swap entry from Kali's fstab but no use. Both Kali and Ubuntu are showing two swap output for swapon.

I thought to solve swap so that sleep/hibernate and other issue don't come later.

I want Ubuntu as normal and safe installation for work and Kali for experiment. If anything that need to change for trouble free Ubuntu then I am ready to change as both are new with no files there.

  • Updated. Added more clarity. – Satya Prakash Sep 10 '17 at 6:38
  • Why don’t you want to share the swap partitions? You could use a single swap for both Ubuntu and Kali. Also, 46.6GiB and 28GiB is way too much swap. – Stephen Kitt Sep 10 '17 at 11:29
  • I read that sleep/hibernate won't work correctly with shared swap. That's why I want separate one. – Satya Prakash Sep 11 '17 at 5:27
  • You want to hibernate both Kali and Ubuntu simultaneously? – Stephen Kitt Sep 11 '17 at 5:35
  • 1
    No, there’s no other issue. There are other issues with hibernating multiple operating systems, it’s not something I would try (in particular, you can’t share any file system among the different environments). – Stephen Kitt Sep 11 '17 at 5:59

you need to fix your /etc/fstab file, it probably has both swaps on Ubuntu and Kali, just erase the partition that you don't want to use on each and reboot.

About the booting, whenever you update grub on any of both distros, they'll update your /boot/grub/grub.cfg file and it will have the latest grub from the latest updated distro, (Kali is the blue and Ubuntu the purple if I'm not wrong) if you just want to update grub once, you can uninstall grub from one of the two distros and whenever you update the distro with grub installed, it will automatically reconfigure and search for the other distro too.

  • From Ubuntu, I see one swap in /etc/fstab. # swap was on /dev/sda3 during installation UUID=15228eb0-15a1-4900-9f46-0dd1516b26ca none swap sw 0 0 – Satya Prakash Sep 10 '17 at 4:22
  • please be sure that this is not a known issue like this and if you are using GPT as label, then you can disable it with systemctl mask dev-sdXY.swap where X is the letter and Y the number of the partition – Christopher Díaz Riveros Sep 10 '17 at 4:34
  • I saw fstab of Kali was having two swap entries. I removed one which I created for Ubuntu but nothing has changed. I see, change in fsab in Kali is done and stayed. – Satya Prakash Sep 10 '17 at 6:24
  • Also my Laptop is UEFI based, if it matters. – Satya Prakash Sep 10 '17 at 6:25
  • Yes UEFI means that you are using a GPT label on your disk, refer to last comment and try systemctl... – Christopher Díaz Riveros Sep 10 '17 at 15:30

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