Tried with set debug=chain
got the following messages (grub 2.04-1ubuntu5, AMD64 arch, ubuntu 19.10): loader/efi/chainloader.c:1057: linuxefi_secure_validate: 1 loader/efi/chainloader.c:262: No shimlock protocol loader/efi/chainloader.c:537: Secure boot is not enabled alloc magic is broken at 0x7bf9b340: 0 Aborted. Press any key to exit. Press any key - returns to grub menu. But once I pressed <return> and it successfully booted win 10! At other times there was no 'alloc magic' error and no pause to press any key: just returned to boot menu instantly. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1839317 Title: Grub fails to chainload the Windows Boot Manager To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1839317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
