ubuntu not booting in dual boot with windows 10 in Uefi mode

[minodev]

Hello everyone,

I have a laptop with a pre-installed Windows 10. I wanted to switch to ubuntu, but I decided to leave windows installed in case ubuntu's installation doesn't work. So I created a new partition and installed ubuntu 16 LTS on it in uefi mode, using a live USB made by Rufus.
Ubuntu was installed successfully and restarted. But Windows quickly loaded as if nothing happened. And I can't access Ubuntu. Even by holding Shift+Restart and chosing Ubuntu.

I tried every solution I found especially those mentionned in :

http://askubuntu.com/questions/221835/installing-ubuntu-on-a-pre-installed-windows-10-with-uefi
https://help.ubuntu.com/community/UEFI


I used the command bcdedit to set the path to ubuntu

C:\WINDOWS\system32>bcdedit

Windows Boot Manager
--------------------
identifier {bootmgr}
device partition=\Device\HarddiskVolume2
path \EFI\ubuntu\shimx64.efi
description Windows Boot Manager
locale en-GB
inherit {globalsettings}
default {current}
resumeobject {11e89e34-0792-11e6-bec9-91b447580268}
displayorder {current}
toolsdisplayorder {memdiag}
timeout 30


Windows Boot Loader
-------------------
identifier {current}
device partition=C:
path \WINDOWS\system32\winload.efi
description Windows 10
locale en-GB
inherit {bootloadersettings}
recoverysequence {11e89e36-0792-11e6-bec9-91b447580268}
recoveryenabled Yes
isolatedcontext Yes
allowedinmemorysettings 0x15000075
osdevice partition=C:
systemroot \WINDOWS
resumeobject {11e89e34-0792-11e6-bec9-91b447580268}
nx OptIn
bootmenupolicy Standard

I started Live CD version of ubuntu to copy shimx64.efi to /EFI/Boot and /EFI/Microsoft/Boot and renamed it to Bootx64.efi and Bootmgfw.efi using a Terminal. And when I restarted, nothing happened and I got this error :


Insert system disk in drive,
Press any key when ready....

Then I restored back the boot files, and retried with Boot-Repair's recommended repair. Restarted, and I got the same previous error...

I also can't choose ubuntu to boot first from Uefi boot in bios setting, as I find only HDD/SSD, USB memory, ODD, LAN1, LAN2 ....
Same when executing the command efibootmgr .


Please help me. I wasted an entire day trying differents solutions as nothing seem to work out for me.

Computer infos:

Toshiba Portege R930 series
Os : Windows 10
UEFI boot with secure boot
Intel Rapid Start
SSD 256 Go

[oldfred]

You do not want to rename /EFI/Microsoft/Boot/bootmgfw.efi.
That process was used when other work arounds were not known. But then you could only boot Windows from a grub entry using the renamed file. And Windows updates overwrote it anyway.

Most systems do work with the fallback entry of /EFI/Boot/bootx64.efi making that file really be shimx64.efi and booting from UEFI a hard drive boot entry that boots /EFI/Boot/bootx64.efi.

Most that have these issues will never boot the ubuntu entry in UEFI. They have modified UEFI to boot using description which is specifically not allowed in UEFI spec. But fallback or hard drive boot entry still works. If you have the bootx64.efi file that is a just a copy of the Windows bootmgfw.efi file. Boot-Repair will copy bootx64.efi to a backup and copy shimx64.efi if you check "use the standard efi file" in advanced mode.
But you may need UEFI entry to boot fallback or hard drive entry.

May be best to see details, you can run from Ubuntu live installer or any working install:
Post the link to the Create BootInfo summary report. Is part of Boot-Repair:
https://help.ubuntu.com/community/Boot-Info

Older threads, users manually copied shim as Boot-Repair did not then do the copy.

Toshiba Satellite - turned Secure boot off in Boot-Repair update
http://ubuntuforums.org/showthread.php?t=2317643
Toshiba satellite z930 copy shimx64.efi to /EFI/Boot/bootx64.efi
https://askubuntu.com/questions/597052/can-not-boot-anymore-after-a-boot-repair
Toshiba Satellite P55-A 0[SOLVED] Dual boot Windows 8.1 and Ubuntu 14.10 rename bootx64.efi
http://ubuntuforums.org/showthread.php?t=2267408
Toshiba Satellite P55-A (UEFI) [SOLVED] Trouble installing Xubuntu 14.04 - file rename
http://ubuntuforums.org/showthread.php?t=2247186
(http://ubuntuforums.org/showthread.php?t=2247186)Can't boot into Ubuntu on a Windows 8 machine (Toshiba P50) Manually copy files cp & mv
http://ubuntuforums.org/showthread.php?t=2257259
http://ubuntuforums.org/showthread.php?t=2261061
(http://ubuntuforums.org/showthread.php?t=2247186)

[minodev]

Thank you a lot for your help. Unchecking "Secure boot" in Boot-Repair before starting the repair and disabling Secure boot in my Bios settings made Grub show up thus allowed me to access both installed Ubuntu and Windows 10.
This was partially mentioned in :



Toshiba Satellite - turned Secure boot off in Boot-Repair update
http://ubuntuforums.org/showthread.php?t=2317643
(http://ubuntuforums.org/showthread.php?t=2247186)

Thank you again.