Public bug reported: This occurred after a fresh install of 16.04 on an Acer Desktop. At the start only Windows would boot -- no Grub2 screen appeared. I made a number of attempts following "https://help.ubuntu.com/community/UEFI" Nothing worked and they suggested trying "http://askubuntu.com/questions/221835/installing-ubuntu-on-a-pre-installed-windows-10-with-uefi" I executed a suggested command "bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi" This gave the Grub2 menu but only in unsecure boot mode. The same document says to send a bug report if an invalid signature is detected. I am doing that. However in doing so i note that the bug report is sent to "shim". But the instructions said to set the path to "grub64.efi" and not "shimx64.efi" which was also available in the /boot/EFI folder.
ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: shim 0.8-0ubuntu2 ProcVersionSignature: Ubuntu 4.4.0-47.68-generic 4.4.24 Uname: Linux 4.4.0-47-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 CurrentDesktop: Unity Date: Mon Nov 14 20:47:37 2016 Dependencies: EFIBootMgr: BootCurrent: 0001 Timeout: 2 seconds BootOrder: 0001,0000 Boot0000 ubuntu VenHw(99e275e7-75a0-4b37-a2e6-c5385e6c00cb) Boot0001* Windows Boot Manager HD(1,GPT,a30e4f73-c41a-4d41-8b33-8bc3beb73cc0,0x800,0x32000)/File(\EFI\ubuntu\grubx64.efi)WINDOWS.........x...B.C.D.O.B.J.E.C.T.=.{.9.d.e.a.8.6.2.c.-.5.c.d.d.-.4.e.7.0.-.a.c.c.1.-.f.3.2.b.3.4.4.d.4.7.9.5.}...}................ InstallationDate: Installed on 2016-11-12 (3 days ago) InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) SourcePackage: shim UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: shim (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1641793 Title: Invalid Signature detected -- must uncheck secure boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/shim/+bug/1641793/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs