I have installed Kubuntu alongside windows in my asus laptop. After Installing successfully. Firstly, I cant access windows boot manager from grub screen. If I click the option , it shows can load image. Secondly, I cant access kubuntu either. It shows load kernel first. Then i went to uefi firmware setting . then i was able to access windows or kubuntu successfully using boot options .So my issue is i cant access windows or kubuntu using grub screen . but i can access using uefi boot options. what can i do to resolve this.
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Last edited by Snowhog; Apr 01, 2025, 12:13 PM. -
Try this:
1 Using your UEFI, boot into Kubuntu (as you explain doing so above).
2 Make sure that os-prober is working (not disabled):
Open this file (using Kate): /etc/default/grub.
(Open Konsole, type kate /etc/default/grub. Or navigate (in Dolphin) to /etc/default/grub and double-click to open it.)
Add this line to the file: GRUB_DISABLE_OS_PROBER=false
If the line GRUB_DISABLE_OS_PROBER=true is already there, change it to read false.
Save and close Kate.
3 Open Konsole, and type this command, then press Enter:
sudo update-grub
After it executes, there should be a boot entry for your other operating systems; in particular for Windows.
Re-boot to test it.
If that didn't work, I'm baffled, but then I don't deal with Windows anymore.
But I would try again:
After booting into Kubuntu and enabling os-prober (as above -- Steps 1 & 2), try reinstalling GRUB:
At Konsole:
sudo grub-install
and press Enter.
when that is done, do:
sudo update-grub
and press Enter.
Then, certainly (!) you should be able to boot Kubuntu with a choice to boot into Windows.
Re-boot to test it.
(Actually, the command sudo grub-install also calls the command update-grub, I think, but it doesn't hurt to run the two commands as I've indicated.)
EDIT:
There could be one catch here. If you reinstall GRUB (sudo grub-install), I'm not sure if that sets the file /etc/default/grub back to its default, but it probably does.
So, after re-installing GRUB with sudo grub-install, do again Step 2: Make sure that os-prober is working (not disabled) -- GRUB_DISABLE_OS_PROBER=true
Then do sudo update-grub.
Then re-boot to test it.Last edited by Qqmike; Mar 31, 2025, 07:22 AM.An intellectual says a simple thing in a hard way. An artist says a hard thing in a simple way. Charles Bukowski -
I edited my recipe in Post # 2.An intellectual says a simple thing in a hard way. An artist says a hard thing in a simple way. Charles BukowskiComment
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Great. (No need to re-install GRUB -- good!)sudo update-grub solved the issue
Thanks for your feedback. It may help others who have the same problem.An intellectual says a simple thing in a hard way. An artist says a hard thing in a simple way. Charles BukowskiComment
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