Secure Boot is an UEFI feature that blocks unsigned drivers and operating systems from running. Use this tag if you have questions about Ubuntu on a secure-boot enabled system.

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Network issue with Broadcom 43142 - solved by turning off secure boot? Is it safe? [on hold]

A few days ago I had problems with my wireless connection; I couldn't see wifi networks :/ It was really strange. My network card is Broadcom BCM43142 and to be honest I found a lot of topics about ...
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17 views

Nvidia 361 with Secure Boot enabled on Ubuntu 16.04 [duplicate]

Does any one know of any ways one could have Secure Boot enabled and still be able to get past the log in screen?
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1answer
41 views

Add Ubuntu EFI DB and PK back into UEFI

I reset my bios and now my Ubuntu 16.04 disk wont book because it can't find the Ubuntu secure boot keys. How can I add these back into my UEFI so it will boot? When I try to boot I get a message: "...
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1answer
138 views

Disable secure boot y/n?

I have windows 10 installed. Im trying to install ubuntu. Should i turn off secure boot or leave it on? What does it do?
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47 views

Replace Grub2 by W10(encrypted) bootloader on UEFI

I have two windows partitions, one of which is encrypted with bitlocker. Also I now added a third partition on which I installed Ubuntu. Unfortunately this gave me a cascading bootloader structure: ...
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131 views

Ubuntu 16: Software Updater issue - Secure boot password

Whenever I update VirtualBox or Nvidia proprietary drivers, I get the following error: After that, I needed to restart the computer or force to close the Software updater and execute sudo dpkg --...
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57 views

Nvidia drivers and UEFI working together [duplicate]

I have Ubuntu 16.04 and after enabling Secure Boot Nvidia drivers stops loading. Same is with VirtualBox kernel modules. When I try to force loading kernel # modprobe nvidia_361 modprobe: ERROR: ...
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1answer
528 views

Unable to disable secure boot with mokutil in 16.04

Problem, new in 16.04: When I run the command sudo mokutil --disable-validation to disable secure boot validation within Ubuntu, I am asked to type a password twice and then get the message ...
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85 views

Skip sign verification at module loading

With secure boot enabled, is there a way to load a custom kernel module not signed, or signed with an auto-generated private key? Trying to load my custom module, insmod exits with the error Required ...
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1answer
140 views

Troubleshooting Secure Boot

When trying to boot Ubuntu with UEFI Secure Boot enabled, I get the following error when loading GRUB: Boot failure : a proper digital signature was not found. One of the files on the selected ...
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478 views

Why was I asked to create a password in order to disable secure boot on initial installation of Ubuntu 16.04?

On initial installation of Ubuntu 16.04, I checked off "Install third-party software" and, underneath it, I was prompted to check off another option which would allow the OS package to automatically ...
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1answer
352 views

“Booting in insecure mode” when secure boot is turned on

I have a dual boot (UEFI) Windows 10 Pro and Ubuntu 16.04. During Ubuntu install IT asked me to turn off secure boot, so I did it, using the installer. When I finished installation, I turned secure ...
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3answers
2k views

Why do I get “Required key not available” when install DKMS modules in Ubuntu 16.04?

When I try to install DKMS modules like VirtualBox, Nvidia, or Broadcom drivers, they do not install and I get Required key not available. How can I fix it?
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2answers
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secure boot issue : win10 & ubuntu16.04

I was asked to disable secure boot in order to install third party drivers on ubuntu 16.04. So I followed the instructions of MOK managemnt to disable secure boot. But secure boot is still on in bios....
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6answers
10k views

Could not load 'vboxdrv' after upgrade to Ubuntu 16.04 (and I want to keep secure boot)

I upgrade from Ubuntu 15.10 to 16.04 and since then VirtualBox 5.0.18 isn't starting my VMs anymore. It complains that 'vboxdrv' isn't loaded. So I try to load it and get the following error: $ sudo ...
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2answers
4k views

Why disabling “Secure Boot” is enforced policy when installing 3rd party modules

When installing 16.04, I was asked to turn off "Secure Boot" if I wanted to install 3rd party modules/drivers. I did not comply. And when I installed manually the only 3rd party drivers I use (bcmwl-...
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0answers
50 views

Secure Boot failed Error at Booting

I installed WinUSB to create a bootable drive for another system. I restarted my Ubuntu 14.04 and it shows an error as "Secure boot failed operating system is invalid". I have installed just Ubuntu ...
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2answers
104 views

I can not boot ubuntu installation CD nor installation USB-drive with HP Envy DV6 notebook [duplicate]

Hello two weeks ago I uninstalled windows 10 and installed fedora 23 using a USB drive created by win32diskimager. My notebook : HP Envy dv6 current OS : fedora 23 Fedora 23 have some bugs with my ...
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1answer
146 views

ubuntu 15.10 installation UEFI problem

I have an ASUS n550-jk laptop and I wanted to install Ubuntu 15.10 alongside Windows 10 (with dual boot) with UEFI. After going to booting menu and choosing boot option (I tried both bootable USB and ...
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0answers
101 views

Windows RT and secure boot

I have read that it is not possible to boot another OS on the Surface RT(1G), because of the secure boot. But I also read that certain Linux OS can be booted even if there is secure boot. So why isn'...
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1answer
63 views

boot Ubuntu 14.04.3 problem from grub2

I have a problem installing Ubuntu 14.04 LTS on my ASUS Zenbook UX301LA-DH71T. The long story: I installed an older version of Ubuntu when I bought the Zenbook (I think it was a 12.XX version). I ...
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1answer
93 views

With secure boot disabled, is there long term vulnerability to malicious code (on 14.10 and 15.04/Win multiboot setups)?

In a nutshell: is it really a good safe idea to leave Secure Boot disabled? I have two laptops with LinuxMint,Xuntu, Ubuntu 14&5 Win 10 and Win 8.1 between them. Grub 2 works fine with /,/boot ...
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1answer
87 views

Can I disable SecureBoot, even though my motherboard doesn't give me the option to do that?

It does not give me the option to run alongside windows during installation, tried to make Grub2 pop up manually, but it kept giving me an error. I run UEFI btw.
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1answer
349 views

Ubuntu: “Booting in insecure mode” with SecureBoot enabled

I have just installed Ubuntu 15.10, after having been with 16.04 LTS for some time to try it out. While I was using 16.04, I tried to install Nvidia Drivers and got told that I needed to disable ...
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1answer
364 views

Installing Ubuntu 14.03 with UEFI

I'm trying to install Ubuntu 14.03 on my new Odys Trendbook 12. It came with Win 10 pre-installed. My problem is that I don't have the option to disable Secure Boot in the UEFI Settings. I created a ...
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1answer
107 views

Blank screen after installing ubuntu on flash drive and booting it from computer with Windows 10 preinstalled

After installing ubuntu on a flash drive and setting the bios to load OS from that drive, I boot to a blank screen. After a minute or so Windows will boot from the hard drive. I am working with an ...
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3answers
4k views

How to fix Secure Boot error “Image failed to verify with *ACCESS DENIED*” on startup?

When I started up my machine this morning (I have Secure Boot and UEFI only enabled) I got this error (sorry for low quality image): What does it mean by Image failed to verify with *ACCESS DENIED*?...
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1answer
91 views

Partial Upgrade removes signed GRUB EFI and breaks Secure Boot [closed]

Software Updater wants me to do a partial upgrade, and the list of changes shows that it removes the grub-efi-signed package and replaces it with the regular unsigned grub-efi. I tested this in a VM, ...
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225 views

Boot Ubuntu 15.10 on Surface Pro 3 from external SSD

I'm trying to get Ubuntu to boot from an external SSD on my Surface Pro 3. No luck so far. That's what I did: Flashed the image on a USB drive using Universal USB Installer Booted into the USB ...
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1answer
55 views

Can I install Ubuntu on major OEM systems? [duplicate]

I want to buy a laptop and install Ubuntu on it. Most laptops these days are Windows 10 based, which require a UEFI secure boot, but don't require it to be unlocked. So I can imagine that most OEMs ...
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137 views

After Lubuntu 15.04 to 15.10 upgrade : Secure boot problem

I am on a Asus ROG G551. I upgraded a Lubuntu 15.04 (previously upgraded from a 14.10), to 15.10, after the upgrade it didn't boot anymore, Red Screen complaining about some "Secure boot" problem ...
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I am about to buy a new laptop to run Ubuntu. Will it boot on it? How do I check?

I have some questions regarding the statement below: Ubuntu’s boot loader isn’t signed with a key that’s required by Microsoft’s certification process, but simply a key Microsoft says is “recommended.”...
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80 views

Asus N56J locked bios prevents me from installing ubuntu

Ive been trying to install ubuntu on my laptop for hours via disabling the secure boot option in bios with out success. Ive been getting the error 0xc000007b time and time again. ive tried the shift +...
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0answers
448 views

Enabling SecureBoot

I want to enable Secure Boot on my asus ux303ln laptop to enhance security. This means I do not want to use "shim" bootloader to be able to dual-boot into Windows, and I do want to have my own ...
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2answers
96 views

eufi\secure boot and auto booting into ubuntu after fresh install

i performed a fresh installation of ubuntu 14.04 amd64 from a usb device as my only operating system, on a new hard drive device. i've tried many uefi combinations after reading Installing Ubuntu for ...
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2answers
850 views

dual-boot with secure boot: invalid signature

So, I got this Dell Inspiron 15 laptop with Windows 10 a couple of months ago. I installed Ubuntu 14.04 to have as dual boot since I rarely use Windows. Today, I did an update and some grub related ...
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1answer
108 views

How to disable boot menu?

Sometimes, when I reboot the dirty way, I get a menu (black screen, grey letters) . This is asking to choose what/how I want to launch Ubuntu (very sorry I dont remind which modes). How is it ...
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1answer
31 views

Does the Dual-boot in secure mode works the other way?

Its a common error that users can't boot into Windows through Grub while using Secure-boot. Some "image not found" error comes up. Disabing secure-boot works though. That is when when we install ...
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284 views

Ubuntu 15.04 install freezes with “booting in insecure mode”

This is essentially the question Joao asked (How to solve "boot in insecure mode" error?), but I was not able to fix this issue on my laptop: I upgraded my 4 year old Acer Travelmate 8473TG ...
2
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0answers
526 views

GRUB not appearing after installing Ubuntu 15.04 on Windows 10 dual-boot

I have recently upgraded from Windows 8.1 to Windows 10. I tried to install Ubuntu 15.04 in dual boot configuration. PROBLEM: The system directly boots into Windows without the GRUB screen appearing. ...
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2answers
651 views

How to enable Secure Boot without issue?

I read here that it is essential to have Secure Boot enabled: However I find that when I enable Secure Boot, it changes it so that systems can boot with UEFI boot, but not Legacy, it also disables ...
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149 views

grub2 insmod Secure Boot

Will grub2 load signed grub modules when the system is set to Secure Boot? Where are signed grub modules? How can I tell if a grub module is signed? I have my system set up to boot Windows or ...
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0answers
61 views

How to sign bootloader.efi when private key is in HSM

Normally i use sbsign to sign .efi file when i can access my private key directly. But now we're using HSM, I can't access my private key as file, i only can tell HSM what to sign, and get the ...
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1answer
13k views

Windows 10 / Linux Dual Boot - Boot-loader Problems

I am currently running a dual boot of Windows 10 Home 64-bit and Xubuntu 15.04 64-bit on my machine. I have Windows 10 on an SSD, Xubuntu on another SSD and an HDD for storage formatted as NTFS (this ...
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0answers
133 views

reboot and select proper boot device or insert boot media in selected boot device ubuntu

This appeared after I replaced my windows 8 on my Toshiba satellite with Ubuntu 14.04.2LTS. What can I do??? I have tried everything, re-installing it, I have been trying using USB flash drive and CD, ...
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1answer
682 views

Can I reenable Secure boot after having installed Ubuntu 15.04 successfully next to Win 8.1?

The title is basically my question: I have (seemingly) managed to successfully install 15.04 next to the existing Win 8.1. I did this with Secure boot disabled to be on the safe side. can I now ...
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1answer
489 views

UEFI Dual Boot partitioning with 14.04 and Win 8.1 on SSD + HDD

I'm setting up a new machine with a SSD and a HDD. Windows is for gaming and Ubuntu for working. I'll install 8.1 first and leave 10GB on the SSD for /. On the HDD I'll leave 120GB for /home and the ...
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1answer
190 views

How to install ubuntu15.05 stand alone using UEFI mode and boot secure enable in lenovo flex 2?

I installed Ubuntu successfully using legacy mode but in UEFI mode I faced some problem. And Ubuntu boot loader asked me to create extra minimum 35MB space to EFI boot loader. I don’t know why? and ...
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1answer
127 views

Ubuntu 14.10 dual boot with preinstalled Windows 8

I wanted to install Ubuntu with my VAIO laptop with preinstalled Windows 8. So I downloaded the ISO image of ubuntu-14.10-desktop-amd64 and extracted to my USB drive with Universal USB installer. I ...
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1answer
38 views

ubuntu login from winwows 8.1

I have dual booted Ubuntu 14.04 with Windows 8.1. I restarted the pc with command shutdown -r now in Ubuntu Terminal. The PC restarted but now I can only access Windows and can't login to Ubuntu. ...