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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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 ...
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1answer
23 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
33 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
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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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48 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
157 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
45 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
836 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 ...
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1answer
77 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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189 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
48 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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109 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 ...
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0answers
56 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
290 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
63 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
414 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
60 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
27 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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0answers
231 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 ...
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0answers
417 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
270 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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0answers
102 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
27 views

Secure Boot : No Dual Boot

How to load-up Ubuntu keys in secure boot? I simply want to install Ubuntu 14.04 as my only OS and in secure boot. Right now I'm getting the error "Invalid secure boot policy" but it boots up after ...
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45 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
11k 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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108 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
359 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
381 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
152 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
109 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. ...
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Ubuntu dual-boot with preinstalled win 8.1 - How to install properly? [duplicate]

Is it possible to install Ubuntu alongside pre-installed Windows 8.1? Would it cause the removal of 8.1? I also heard something about UEFI and secureboot and such things that could cause problems. ...
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1answer
4k views

How to use the Linux Foundation's PreLoader?

I read that there is another way than using shim and signed GRUB binaries for Secure Boot by using the Linux Foundation's PreLoader or Linux Foundation's Secure Boot System, but how do I use it? ...
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3answers
6k views

How to solve “boot in insecure mode” error?

I'm trying to install Ubuntu 14.10 x64 on my laptop. But I always get "booting in insecure mode" message and then nothing happens. My laptop has BIOS Legacy not UEFI. There's any option about security ...
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1answer
898 views

No HDD in boot order in BIOS in Asus x555LA

Today I bought a brand new ASUS X555LA laptop with Window 8 pre-installed. So I tried to install Ubuntu 12.04 64bit using a USB flash drive. My first boot was USB (not UEFI) and I was successfully ...
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1answer
244 views

Ubuntu 14.04 On Asus Zenbook UX302LA

I have an Asus Zenbook UX302LA with Win8 pre-installed that I bought new in the summer of 2014. I now want to dual-boot it with Linux Ubuntu 14.04 (latest version I believe). I can get it to boot no ...
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1answer
142 views

Want Ubuntu and Windows both on My Laptop

Some days ago i used Ubuntu 14.04 LTS for 2 weeks and loves it. On that time i had completely install Ubuntu on my laptop. Now the problem is i also has to developed .Net applications. So i need both ...
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5k views

Ubuntu on Surface RT?

A continuation of Can Ubuntu run on a Microsoft Surface with Windows RT? Regarding the Duplicate Votes: Technology has changed. Now that Ubuntu natively supports UEFI and Secure Boot, this ...
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2answers
12k views

Ubuntu 14.04 single-boot with UEFI-mode enabled

I recently purchased a Dell Vostro 5470 with a pre-installed Windows 8 OEM on a HDD 500GB. Now I'm trying to replace the HDD with a Sandisk SSD 240GB as my main disk (next step will be use the HDD ...
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1answer
171 views

No grub after switching to “boot in secure mode” (Windows8) after Ubuntu being installed

I installed successfully Lubuntu 14.10 alongside Windows8. Being tired of seeing "Booting in insecure mode..." as the PC turned on, I enabled again "boot in secure mode" from Win. As a result the Grub ...
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3answers
343 views

Need help in Installing Ubuntu on Laptop with Secureboot

I just purchased HP G049AU whose configuration is : - AMD A8 - 4 GB RAM I checked that secureboot is enabled. I want to completely remove Windows 8.1 with Ubuntu 14.04.1 I would like to know : Can ...
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0answers
74 views

How can I compile and sign Grub in a way that Secure Boot will allow?

Since the file .efi of Grub2 compiled by myself hasn’t gone through code signing (such as EV code signing certificate), and now my program (.efi file) can’t boot computers which have enabled Secure ...
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2answers
280 views

Grub Setup for dual Ubuntu under EFI

I have installed to versions of Ubuntu, one up-to-date Xubuntu and a 12.04.5LTS Ubuntu. I first installed Xubuntu and later Ubuntu. Since the 12.04 would not write a correct grub-conf on install (I ...
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1answer
485 views

Lubuntu 14.04.1 - load installer components from cd fails, although integrity is ok - why?

I am trying to install lubuntu-14.04.1-alternate-amd64 on a USB Stick - and oh my, is that some trouble. My Setup: Win7 UEFI System with enabled Secure Boot My Target: 64GB USB 3.0 Stick in USB3 ...
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2answers
7k views

Lenovo G500 how do I turn off secure boot to install Ubuntu 14.04?

I am trying to install Ubuntu 14.04 on Windows 8.1. I have gone through the manuals in the internet and in "askUbuntu" but I have found no solution. I have turn off "fast boot" option in Windows as ...
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0answers
1k views

Ubuntu 14.04 LTS desktop not getting shutdown

My Computer : Intel i5-4440 Quad Core on Intel Motherboard DB85FL (built-in graphics). I upgraded to Ubuntu 14.04 LTS from 13.10 through 'Software Updater'. The process was fully automatic and ...
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1answer
44 views

Laptop doesn't show systems menu while booting

Welcome all, I have installed Ubuntu 12.4 lts on win 8 with secureboot enabled now after installing it the PC boots directly to Ubuntu and I cannot access win 8 When use boot repair it asks me to ...
2
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2answers
1k views

Boot problems after uninstalling Ubuntu

I have a Sony Vaio PC and after uninstalling Ubuntu from my laptop I went into a problem that I can't fix. I get a error message that says: SECURE BOOT FAILED! Your VAIO has detected an invalid ...
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1answer
3k views

Installing Ubuntu 13.10 with UEFI/secure boot enabled. Dualboot with win 8.1

First of all: I am well aware of the following the existing thread on UEFI, as well as the guide by Rod Smith, and I have read on the problem on various forums for maybe 10 hours (2 days), but could ...