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I'm not getting any option to select the OS. The laptop directly boots into Ubuntu (my main OS) even though kali linux is properly installed in about 300 gb. A technical support will be appreciated.

Regards

pratik pattanaik
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1 Answers1

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Just boot up Ubuntu and run the following command to update your Grub menu:

sudo update-grub

Then, reboot.

terdon
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mchid
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  • I assume you mean sudo update-grub, but don't you also need sudo grub-install afterwards? I haven't used grub in a few years, but you used to. – terdon Nov 28 '19 at 17:50
  • @terdon Here is an example where the other os is Linux Mint. – mchid Nov 28 '19 at 19:05
  • Yes, that isn't the question. update-grub will detect installed OSs and will write a new /boot/grub/grub.cfg file. What I am not completely sure about is whether or not that new file is actually read by grub on boot or if it is copied somewhere by grub-install. The old grub (grub1) used to be able to read the file directly and manually editing it would change the menu, but I seem to recall that grub2 does not and you might need the grub-install command to make the new config take effect. But, as I said, I'm not sure. – terdon Nov 28 '19 at 19:11
  • @terdon Yes, on grub2, changes that I've made to /boot/grub/grub.cfg have shown up directly on the grub menu after running grub-install including any customization or new OS. However, update-grub must be run from the OS that installed the current grub menu or the changes will not take effect. The only time I've had to run grub-install is to repair or replace a broken grub using this method. – mchid Nov 28 '19 at 19:36
  • @terdon However, if you were to make changes to the Kali /boot/grub/grub.cfg, you would need to run update-grub and grub-install on Kali for the changes to take effect because the current grub is linked to Ubuntu. – mchid Nov 28 '19 at 19:40