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"Secure boot" no longer work (Ubuntu 15.10)

Hi,

I own a Samsung laptop and I have successfully installed Ubuntu using UEFI alongside Windows 10 (upgraded from Windows 8.1 OEM).
Fast boot and Secure Boot were both enabled on bios side, when I installed Ubuntu.

Everything worked great, until I:
- discoected my inteal dual booting SSD
- coected a old inteal bootable HD with windows 10 (and use it)
- recoected my inteal dual booting SSD
- never changed bios settings

Now, when grub tries to start, the bios says "Secure boot violation - Signature failed".
However I can load it by forcing "UEFI" (option 2BC below) in my system settings, without any problem.

Code:

 gdisk partition table
Number  Start (sector)    End (sector)  Size       Code  Name
   1            2048         1024000   499.0 MiB   2700  Basic data partition
   2         1024001         1638401   300.0 MiB   EF00  EFI system partition
   3         1638402         1900546   128.0 MiB   0C01  Microsoft reserved ...
   4         1900547       782996189   372.5 GiB   0700  Basic data partition
   5       928800768       929720319   449.0 MiB   2700  
   6       929722310       974675910   21.4 GiB    2700  Basic data partition
   7       974675911       976773063   1024.0 MiB  2700  Basic data partition
   8       782997504       912265215   61.6 GiB    8300  
   9       912265216       928800767   7.9 GiB     8200

Code:

efibootmgr -v
BootCurrent: 0002
Timeout: 0 seconds
BootOrder: 0002,0000,0004
Boot0000* Windows Boot Manager    HD(2,GPT,97287ad7-892c-49ee-ac22-8cf741104997,0xfa001,0x96001)/File(EFIMICROSOFTBOOTBOOTMGFW.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.}...i................
Boot0002* ubuntu    HD(2,GPT,97287ad7-892c-49ee-ac22-8cf741104997,0xfa001,0x96001)/File(EFIUBUNTUGRUBX64.EFI)
Boot0004  TSSTcorpCD/DVDW SH-S182MSB03    BBS(USB,,0x0)AMBO

Can someone explain me what probably happened?
Any advice on how can I setup my original bios configuration (SECURE BOOT ENABLED)?

The inteal disk is a Samsung EVO 850 SSD.
My available BIOS settings for UEFI are:

Code:

SECURE BOOT:
============
1) Secure ON
2) Secure OFF
   A) CSM OS
   B) UEFI OS
   C) CSM OS + UEFI OS

Thank you!

S

برچسب: نویسنده: استخدام کار تاريخ: جمعه 13 فروردين 1395 ساعت: 5:36

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