Questions about using grub on EFI/UEFI systems relating to configuring, installing or removing grub from EFI/UEFI partitions.

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33
votes
3answers
107k views

How can I change/convert a Ubuntu MBR drive to a GPT, and make Ubuntu boot from EFI?

I recently have upgraded my PC, my new Motherboard (ASUS M5A99X EVO) uses UEFi instead of the regular MBR option. I have a Ubuntu 11.10 installation that I did when I had my previous hardware (MSI MS ...
5
votes
4answers
31k views

Uninstalling GRUB from UEFI laptop

I installed Ubuntu alongside Windows 8, however have decided to unisntall Ubuntu. First I booted into Parted Magic and, using GParted deleted all the ext4 and swap partitions. This leaves me with ...
3
votes
1answer
8k views

Can I install in UEFI mode with the alternate installer?

I'm wondering if it's possible to install Ubuntu 11.04 UEFI mode with the alternate installer. I've read that only grub-efi is needed to boot in UEFI mode. How do I install that?
0
votes
1answer
9k views

How to boot Windows 8 from a legacy MBR partition in UEFI mode via GRUB?

This question is similar to the answer of Dual-boot Ubuntu 12.10 on UEFI along Windows 8 (GRUB - error: can't find command drivemap), but Windows 8 is installed on a legacy partitioned drive. ...
3
votes
1answer
6k views

How to switch between Gfx cards on Macbook Pro 15" 8.2

I have a Macbook 15" Pro 8.2 Which apparently is supposed to be switchable between the GFX cards with vgaswitcheroo. But /sys/kernel/debug/ contains no switcheroo folder. syslog gives me this. [ ...
7
votes
3answers
22k views

How to install Ubuntu server with UEFI and RAID1 + LVM

I used to install my servers with LVM over software RAID1, and grub install on the MBR of both drives. Now I have an UEFI server, and the compatibility (BIOS) mode does not seem to work. So I went ...
5
votes
2answers
12k views

Unable to boot Windows 8 after Ubuntu installation

I installed Ubuntu on a pc with Windows 8 preinstalled. After installation Grub showed Ubuntu entries and Windows 8 Boot Manager (or something similar), selecting it I got: /EndEntire file path /...
0
votes
1answer
6k views

Restore backup of WinEFI or UEFI (not sure) that boot-repair made

I have a laptop that supports EFI/UEFI. I have Windows 8.1 and Ubuntu 12.04 on it. The way I installed my OSes was like this: I installed Win 8.1 in the required partitions then Installed ubuntu and ...
5
votes
2answers
20k views

Invalid EFI file path

i've just installed Ubuntu 12 on my new laptop ( with Win7 64bit pre installed ) in EFI mode and now i can't load Win7 anymore ( Ubuntu just loads fine from grub ). When i select the Windows 7 entry ...
3
votes
4answers
22k views

Ubuntu 12.04 — grub-efi-amd64-signed failed to install into /target/

I have HP Pavillion 14-n009tu laptop (i-5, 4GB) with Windows-8 OS installed on it. I am trying to install ubuntu 12.04 as a dual boot OS on Windows8. I have disabled fast boot and secure boot options ...
1
vote
2answers
1k views

Does this answer work for UEFI computers?

One of my most popular answers is instructions on how to repair grub. Over time, others have contributed bug fixes to the answer. A recent comment, though, made me wonder if it works on newer UEFI ...
0
votes
1answer
3k views

Dual boot problem, black screen during the ubuntu boot

I have a problem with my dual boot (windows 8 and ubuntu 13.1) on my asus vivo book. Actually I'm writing from a live of linux-secure-remix and I already used the boot repair tools. I can access and ...
2
votes
2answers
2k views

I am having problems booting after I installed Ubuntu. How can I collect information to diagnose and fix the problem?

After installing or updating Ubuntu, I am having problems using GRUB to boot my computer. How do I collect information to determine what is wrong so that I can fix it? Note: This question and any ...
1
vote
1answer
3k views

Can not boot Windows on Legacy BIOS after installing Ubuntu on UEFI [duplicate]

Long story short, I installed ubuntu while I was watching netflix and feeling very lazy, and may have lost all my windows 7 files. Quick summary: -Windows 7 was installed on Legacy bios and I ...
2
votes
3answers
4k views

Can't load GRUB all of a sudden (UEFI problem)

So, the last time I used my Ubuntu installation was last night. Today, as I booted it up, it told me that booting grubx64.efi is not allowed. Easy enough. I know how to re-enable it from my BIOS. ...
3
votes
2answers
2k views

Missing /etc/default/grub

I just re-installed Ubuntu 12.10 after having various issues, it was just time for a re-format and re-install. Installation The install went the smoothest that it has ever gone. Except that on my ...
1
vote
0answers
6k views

Make a portable Ubuntu on a USB stick (bootable on Macbook/iMac)

I have a Macbook Pro 8,1 (early 2011 model). My goal is to have Ubuntu installed onto a USB stick what I can plug into any Macbook / iMac (also potentially any pc) and use Ubuntu anywhere. Here is ...
5
votes
3answers
20k views

ubuntu 12.04.3 LTS installation failed. says: “GRUB installation failed”

The error message is :the grub-efi-amd64-signed package failed to install into /target/. Without the GRUB bootloader the system will not load I'm trying to install it on HP pavilion g6-2303 TX using ...
2
votes
3answers
2k views

error symbol 'grub_term_highlight_color' not found

My dual boot Ubuntu/Windows installation on a Samsung Series 7 laptop is suddenly broken, I do not know why. I have not made an update, and the laptop was not even connected to the internet when it ...
2
votes
1answer
627 views

Can't boot to my usb to install Ubuntu

Recently I deleted Ubuntu gnome desktop from my new laptop dual booting with windows 8 and also repaired the start up so that it would go to windows automatically. However now I want to install Ubuntu ...
2
votes
4answers
6k views

How do I install on an UEFI Asus 1215b netbook?

I'm trying to install Ubuntu 11.10 on a UEFI netbook Asus 1215b using an USB stick. I created a fat32 efi partition of 100MB, 2GB swap, and 2 ext4 partitions (for root (/ ) and /home, respectively). ...
1
vote
2answers
585 views

rEFInd showing 3 ubuntu .efi instead of 2

This is not really a problem, though I am just curious to why do I suddenly see 3 ubuntu, instead of the usual 2. It should be grub64.efi and shim64.efi. Though now it is grub64.efi, vm-linuz-3.13.0....
1
vote
1answer
235 views

Can't remove or install kernel

I accidentally deleted my /boot partition but I was able to get it back with grub-install I'm trying to chroot and install the kernels again via this guide:How to restore a system after accidentally ...
1
vote
2answers
3k views

11.10 dual boot no grub menu

I have installed Windows 7 and then Ubuntu 11.10 on my computer but no grub menu came up on reboot and it went straight into Windows. I then removed the Ubuntu created partitions and tried Fedora 16 -...
1
vote
1answer
667 views

Restore /boot/efi

Recently I apparently corrupted my /boot/efi partition, I got according error messages at boot and a manual console to remount it. I tried to reformat it (mkfs.vfat 32), reinstalled grub (grub-...
0
votes
1answer
386 views

Acer Aspire V3 does not recognize my EFI partition

I just installed Kubuntu on an Acer Aspire V3 netbook with a SSD using GPT and the following partition layout: 1 MB unformatted partition with boot_grub flag, 200 MB FAT32 partition with boot flag, ...
0
votes
2answers
42 views

Ubuntu 15.10 then windows 7 dual boot issue

I've been using Ubuntu 15.10 for a while, but recently installed Windows 7 (quite reluctantly) on the same SSD (converting partition table to GPT as required) but on separate NTFS partition. I thought ...
0
votes
1answer
1k views

How to repair GRUB from backup?

I have Windows 8 and Ubuntu 13.04 in dualboot. But the problem was that Windows didn't boot when GRUB is set as primary bootloader in BIOS. When the Windows EFI partition was checked as primary, ...
0
votes
2answers
6k views

Unable to fix broken package system

After I (painfully) managed to install Skype on my Ubuntu 12.04 LTS, I'm experiencing since months ago a packages issue I cannot fix. Have a look to my last post in order to know what caused this ...
0
votes
3answers
2k views

13.10 doesn't boot on Vaio Pro 13

I just installed Ubuntu 13.10 on my new Vaio Pro 13, disabled safe mode, but used UEFI and not legacy mode. I did an encrypted LVM installation and erased the complete SSD. It booted just fine from ...
0
votes
3answers
825 views

apparent low color depth on EFI Boot

I am running Ubuntu 13.04 and Mint 14 on a Mac Mini 6,2 (Late 2012) - Intel HD4000. When I boot from the legacy BIOS, I see good colour as it should appear. However, when I boot from the EFI partition,...
0
votes
1answer
107 views

Cannot boot with EFI

I was having problems with repairing my boot loader (grub). My GParted config looked like: I installed another Ubuntu to the free space which restored my grub. But when booting into my old partition,...
-1
votes
3answers
10k views

UBUNTU 16.04 ERROR INSTALLING GRUB

My computer has Windows 10 installed, and when I try to install Ubuntu 16.04, it does not detect Windows 10, nor does it detect Windows 10 in my partitions list. On the final step of the installation,...