You have been subscribed to a public bug: 64bits EFI computer (with GPT disk) with pre-installed 64bits Windows7. AND 32bits EFI computer without legacy boot support
1) Installing Ubuntu 12.04 64bit creates a valid /efi/ubuntu/grubx64.efi entry. At reboot, the GRUB menu appears and allows to boot Ubuntu. 2) Installing Ubuntu 12.04 32bits installs grub-pc, which creates no EFI entry. Ubuntu can't be booted (except if it is possible to deactivate EFI mode). 3) Installing grub-efi from an already installed Ubuntu32 creates /efi/ubuntu/boot.efi , and /efi/ubuntu/grubia32.efi . Both EFI entries fail. 4) Installing grub-efi in an already installed Ubuntu32 in chroot via an Ubuntu64 live-CD ( so that grub-efi has access to EFI variables) also creates two invalid EFI entries (/efi/ubuntu/boot.efi , and /efi/ubuntu/grubia32.efi ). CONCLUSION: - grub-efi 32bits always creates invalid entries. - Installing Ubuntu32 bits on an EFI system should be blocked by Ubiquity (the Ubuntu installer). In this case, Ubiquity should ask the user to install Ubuntu64 instead. - the Download page should warn that the 32bits ISO is not compatible with recent (EFI) computers === Workarounds == If you have UEFI-only machine, please use amd64 (64-bit) images. That image will most likely work for you as your machine is highly likely a 64-bit one. If you truly have 32-bit-only CPU and UEFI-only machines please post exact Manufacturer, OEM, make, brand and model number as a comment on this bug report. Currently known machines that are affected are Intel Atom 32-bit System-on-a-chip based machines, such as phones & tablets as listed on: https://en.wikipedia.org/wiki/Atom_(system_on_chip) Please note explicit Intel Atom (CPU) architecture has not been supported in Ubuntu for a while know. The Atom system-on-chip is a new & upcoming type of processors that are not supported by Ubuntu at the moment and further work is required to bring up an Ubuntu port to such machines. At the moment those machines have limited stock, high pricetag and no Ubuntu ports known to be in progress. (potential work-around disable secure boot, prepare usb-stick with 32bit grub-efi image installed, boot of that and perform manual - "debootstrap" based installation: manually partition, manually install grub-efi, debootstrap packages, attempt to boot.) ** Affects: ubiquity (Ubuntu) Importance: Undecided Status: New ** Affects: ubuntu-cdimage Importance: Undecided Assignee: Jonathan (miareggeti) Status: Won't Fix ** Tags: 32bit 64bit boot efi grub intel-atom iso uefi -- Ubuntu i386 images are not compatible with 32-bit UEFI computers https://bugs.launchpad.net/bugs/1025555 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
