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i just recover grub, but it doesn't working ( Dual boot Windows 8.1 and ubuntu 16.04.3) bcdedit show this bcdedit and diskpart this diskpart , i'm sure that ubuntu installed on my hard drive from that efi folder

so, how can i show grub at boot time ?

Bachana
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  • What brand/model computer? Can you boot from one time UEFI boot key, often f10 or f12 check your manual. Post the link to the Create BootInfo summary report. Is part of Boot-Repair: https://help.ubuntu.com/community/Boot-Info – oldfred Oct 26 '17 at 19:52
  • acer aspire e15 e5-573G-33TS , i use f12 key – Bachana Oct 27 '17 at 05:44
  • In your f12 are there unknown entries. Acer has a unique UEFI requirement of setting an UEFI password (never lose that or reset when done) and enabling "trust" on the .efi boot files from within UEFI. https://askubuntu.com/questions/771455/dual-boot-ubuntu-with-windows-on-acer-aspire/771749#771749 & http://askubuntu.com/questions/627416/acer-aspire-e15-will-not-dual-boot – oldfred Oct 27 '17 at 13:30

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https://help.ubuntu.com/community/Boot-Repair
Boot-Repair helped me .... Downloaded as iso and run it as live from usb

  • i didn't try boot-repair as iso , but i reinstall it from ubuntu live usb , grub not working now :( – Bachana Oct 27 '17 at 05:56
  • after that my computer reboots into Windows, how i change BIOS boot order , it only show Windows Boot Loader – Bachana Oct 27 '17 at 07:24
  • in admin command prompt bcdedit /set {bootmgr} path \EFI\ubuntu\shimx64.efi The operation completed successfully. C:\Windows\system32>bcdedit Windows Boot Manager

    identifier {bootmgr} path \EFI\ubuntu\shimx64.efi timeout 20 Windows Boot Loader

    path \Windows\system32\winload.efi

     – Bachana Oct 27 '17 at 07:32
  • Did you try easybcd? Maybe he can solve problem –  Oct 27 '17 at 07:37
  • @Amr__r easybcd can't show me ubuntu partitions – Bachana Oct 27 '17 at 07:45
  • The Boot-Repair ISO is now pretty old, generally better to just use your Ubuntu live installer and add the ppa to download it into Ubuntu live. The ppa is always more current than a fixed ISO. See option #2 https://help.ubuntu.com/community/Boot-Repair – oldfred Oct 27 '17 at 13:33
  • boot loader was installed on /dev/sda and when restart computer it boot in windwos , how can i load grub ? – Bachana Oct 27 '17 at 15:57