grub fails to boot unsigned kernel

[Paul Zeiger]

Hi all,

I have tried to install Ubuntu 12.10 Gnome Remix (stable) from usb-stick. After grub2 has booted I selected try Ubuntu without installing and then I got the following error:

error: file '/casper/vmlinuz.efi.signed' not found
error: you need to load kernel first.

Please press any key to return.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: grub2 2.00-7ubuntu10
Architecture: amd64
SourcePackage: grub2

Motherboard used: Asus M5A99x EVO (not SecureBoot enabled I believe?)

Kind regards,

Paul Zeiger

[Phillip Susi (psusi)]

The gnome remix is not an official Ubuntu flavor, so you will need to report this problem to its authors.

[Jeremy Bícha (jbicha)]

Philip, I'm reopening this as I believe this is actually a high priority issue for the Release Team to figure out what's not working correctly.

http://irclogs.ubuntu.com/2012/10/21/%23ubuntu-release.html

[Steven Webb (webbsd)]

I'm having the same issue. The problem seems to be the grub configuration is pointing to the wrong filename. It's trying to load /casper/vmlinuz.efi.signed which isn't in the disc image. By editing the boot options to use /casper/vmlinuz I was able to boot successfully without modifying the image.

I have no idea what the security implications are for doing this; however, if others want to try you can do the following:

1) Boot to the grub menu
2) Press F2 (I think it was f2, the instructions at the bottom tell you) to edit the boot option
3) modify the section reading /casper/vmlinuz.efi.signed to be /casper/vmlinuz
4) press F10 to boot

Steve.

[Tim Lunn (darkxst)]

This was fixed with the 12.10.1 image.
https://wiki.ubuntu.com/UbuntuGNOME/ReleaseNotes/12.10

[Colin Watson (cjwatson)]

I deleted the grub2 task as, to the best of my knowledge, this was a configuration bug specific to UGR.