Hello LinuxQuestions community,

I recently decided to install Lubuntu on my computer (pre-installed with Windows 8) to learn more about how dual-booting and partitioning work. The process went pretty smoothly, with one minor issue:

On the GRUB menu, whenever I select "Windows Boot Manager", it gives me the following error:

/EndEntire
file path: /ACPI(a0341d0,0)/PCI(2,1f)/Sata(0,0,0)/HD(2,1f4800,82000,f5f79a8387ee5a48,2,2/File(\EFI
\Microsoft\Boot)/File(bootmgfw.efi)/EndEntire error: cannot load image.

Press any key to continue... _

I am still able to boot to Windows 8. All I have to do is go into the UEFI settings and move Windows Boot Manager up to the first boot priority. However, after I do that, I don't get the GRUB menu upon restarting. I'm taken directly to Windows 8 without any boot menu or choice between Windows and Lubuntu. If I want to boot Lubuntu, I've got to change the boot priority for that again. Once Lubuntu is top priority, I can boot it from the GRUB menu (but not Windows).

I have searched around quite a bit, and a lot of people seem to have the same problem. They say the solution is to disable Secure Boot and Fast Startup, which I've done - to no avail.

So my question is: how can I resolve the above error, so that I can choose between Windows and Lubuntu in the GRUB menu without having to change the boot settings in the UEFI? Thanks in advance.

Did you install Lubuntu in UEFI mode. Review the page below for some information on dual-bootin with UEFI.

https://help.ubuntu.com/community/UEFI

If you can't resove the issue, get boot repiar from the site below and create a bootable CD, boot it and select the option to "Create BootInfo Summary" and post the link here.

https://help.ubuntu.com/community/Boot-Repair

Thank you for the fast response. Yes, I installed Lubuntu in UEFI mode. When I use the command in your first link, it returns "EFI boot on HDD". And here's my BootInfo summary: http://pastebin.ubuntu.com/14184874/

Update: Problem solved. I'm able to boot both Lubuntu and Windows from GRUB. The issue was that I thought Secure Boot was disabled, when it really wasn't!

For anyone who has a Lenovo G500 laptop like me, take a look at this post on the Lenovo forums. There are TWO options for disabling Secure Boot in this brand of laptop, and unless you select "Disabled" for both options, Secure Boot will not be turned off. This is how it would look:

Secure Boot Disabled (this is fine)

Secure Boot Status Enabled (you cannot change this option; it's grayed out. Until you change it, Secure Boot won't be disabled)

To completely disable Secure Boot on your Lenovo G500 (or other laptop if it has a similar configuration), you must click on the option "Reset to setup mode" underneath the "Secure Boot Status" option. Hit "Yes" on the confirmation popup. Now, the "Secure Boot Status" will show up as "Custom". That means, Secure Boot is completely turned off (provided the above "Secure Boot" option displays Disabled). If you ever want to turn Secure Boot on again, click on "Restore factory keys".

Hopefully this helps someone who has the same problem I did. Chances are, your laptop has a confusing Secure Boot configuration and you just didn't turn it off properly.