I recently installed Lubuntu 24.04.3 on my laptop, wanting to try out Linux for the first time. However, since the installation, my Windows 11 won't boot. It sometimes flashes "reset system" and reboots, directly taking me to the Ubuntu boot menu. When I try to access Windows Boot Manager, it shows an error saying "bad shim signature". My Windows partition is still there, but it's not booting up properly. I've tried resetting the BIOS to default settings but that didn't help. My laptop is an HP Pavilion 14-bf060tx with an 8GB RAM and an NVIDIA GeForce 940MX setup, plus a GIGABYTE SSD. If you need any more info to help troubleshoot, just let me know!
3 Answers
I noticed that your list shows both partitions where Windows should be. sda3 is your Windows partition, but it seems there's a problem with how it's loading. If you can, try to access your files from Lubuntu to make sure everything's still there. You might also need to back up your important data, just in case!
It sounds like the issue is linked to Secure Boot and the bootloader. The "bad shim signature" error usually means that the Linux bootloader installed doesn't meet Secure Boot's requirements. Don't worry, your Windows installation is still intact!
First, go into your BIOS settings and try disabling Secure Boot. Then, save your changes and reboot. This often fixes the problem and lets GRUB show both Lubuntu and Windows again.
If that doesn't work, you can repair the Windows bootloader using a Windows USB drive:
1. Boot from the USB.
2. Go to Repair -> Command Prompt.
3. Run `bootrec /rebuildbcd`.
Alternatively, since you can still access Lubuntu, you can install and run 'boot-repair' to automatically fix the boot configuration. Just choose the "recommended repair" option. Hope that helps!
Just to confirm, do you still see the Windows partition available when you look at your disk using `lsblk -f`? That’ll help us understand if your files are intact or if there’s a deeper issue. Let us know what you find!
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