** Description changed: 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. - * ACER W510 tablet + 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.)
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1025555 Title: Ubuntu i386 images are not compatible with recent (UEFI) computers To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-cdimage/+bug/1025555/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
