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I was using Ubuntu 22.04 along with Windows 10 dual boot style. However today I upgraded from 22.04 to 24.04.1 from whatever menu link it provided. 24.04.1 came up well ... however I can no more access Windows. When I power on the system it no more gives me a choice to choose between Windows or Ubuntu... like it used to do.

Any guidance on how to recover from this situation? Thanks in advance.


I tried the above suggested way:

$ sudo update-grub
[sudo] password for xxxxxx: 
Sourcing file `/etc/default/grub'
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-6.8.0-41-generic
Found initrd image: /boot/initrd.img-6.8.0-41-generic
Found linux image: /boot/vmlinuz-6.8.0-40-generic
Found initrd image: /boot/initrd.img-6.8.0-40-generic
Found memtest86+x64 image: /boot/memtest86+x64.bin
Warning: os-prober will be executed to detect other bootable partitions.
Its output will be used to detect bootable binaries on them and create new boot entries.
Found Windows 10 on /dev/sda1
Adding boot menu entry for UEFI Firmware Settings ...
done

However after reboot it directly boots ubuntu ... without giving me the choice of os s. I rebooted twice as one of the suggestions expressed.

Please see if there is anything that I might have missed/overlooked.

Thanks to all of you for your time.

Thomas Ward
  • 78,878

1 Answers1

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Do you have Secure Boot enabled in your firmware settings? If so, turn it off.

You may also need to install and enable the os-prober tool which detects other OSes:

https://ubuntuhandbook.org/index.php/2022/11/dual-boot-os-disappear-after-ubuntu-22-10/