I have an Acer Aspire E 11 E3-112-C6YY which shows the same probably- buggy firmware behaviour.
As Peter found, it'll boot from an Ubuntu USB mass storage device without a problem, but will never show an Ubuntu installation on the same EFI system partition as Windows Boot Manager. But it will reliably show the "Unknown Device" in the same menu when it is reentered awkwardly from GRUB: F12, select USB HDD, c, exit, <boots into USB GRUB automatically>, c, exit, <same boot option menu, but this time with "Unknown Device" which boots to the HDD GRUB>. Putting ubuntu in BootOrder doesn't work, but BootOnce does. I haven't completely verified that BootOrder is respected properly in general, but it seems to be (eg. putting USB HDD above Windows Boot Manager). I also haven't yet tried adding/removing RC, renaming ubuntu to Windows Boot Manager, removing Windows Boot Manager from the EFI system partition, using a separate EFI system partition, or removing Windows entirely. When all boot options are exhausted it will automatically enter some Windows repair thing. I'm not quite sure how that works yet. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1437797 Title: I can't boot ubuntu after installing it dual-boot from kubuntu 14.10 CD prallel to windows 8.1, UEFI secure boot, on an Acer Aspire E15. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/efibootmgr/+bug/1437797/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
