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Questions tagged [grub-efi]

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

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

678 questions
105
votes
6 answers

How to return from grub prompt to the grub menu?

If you press escape in grub menu you end up at the grub command prompt. My question is, how can I go back to the menu, without rebooting?
sorin
  • 10,135
84
votes
4 answers

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 7267) , Ubuntu alone boots fine, and so does…
Uri Herrera
  • 15,318
48
votes
4 answers

accidentally deleted EFI partition, system is still running!

I am running Ubuntu 20.04, I accidentally deleted the EFI partition (Damn GParted!) The system is still running. Can I create a new partition in the now UNUSED area, set the EFI flag and boot flag, and then just run update-grub? Will update-grub…
Dennis D
  • 839
29
votes
6 answers

Impossible to update UEFI dbx

My Ubuntu (20.04) Software is prompting a new firmware available: UEFI dbx 77--> 217 (?), but when I try to update I receive the following error message: Impossible to update UEFI dbx. Blocked executable in the ESP, ensure grub and shim are up to…
Py-ser
  • 687
17
votes
1 answer

Ubuntu 20.04 Upgrade failure concerning grub-efi-amd64-signed

I got this error when running the upgrade on 2021-05-02 as proposed by the system: grub-efi-amd64-signed: Depends: grub2-common (>= 2.02~beta2-36ubuntu3.31) but 2.04-1ubuntu26.11 is to be installed
Gerardo
  • 171
17
votes
2 answers

Move bootloader or remove efi partition in second drive

I'm new here so I apologize in advance if my question is not formally correct. I have a dual boot system, on two different disks. Windows was pre-installed on the first drive (500 Gb), then I installed ubuntu 20.04 on the second 1 Tb drive following…
holdtheline
  • 397
16
votes
4 answers

Invalid EFI file path

i've just installed Ubuntu 12.04 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 in the grub menu, i get this error: Invalid EFI…
Simone Margaritelli
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15
votes
3 answers

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 the way of installing with UEFI. First test, single…
alci
  • 5,979
14
votes
4 answers

How do I install two independent Ubuntu installations on a single hard drive with UEFI?

For security reasons I would like to install a secondary completely independent operating system on a single-hard-drive computer using UEFI. Both installations should be able using different LUKS crypto partitions as root device (LVM on top of…
gertvdijk
  • 69,427
14
votes
1 answer

Errors during upgrade from 17.10 to 18.04 (shim-signed and grub-efi-amd64-signed)

After running sudo do-release-upgrade this morning to upgrade my system from Ubtunu 17.10 to 18.04 LTS, I encountered errors during the upgrade. The trace is too long to post in it's entirety, but here is the part that (to me) looks like the…
R. Barrett
  • 143
12
votes
1 answer

Restore Apple bootloader on an (Intel) Mac after an update-grub was run by an external Ubuntu installation

I have Ubuntu installed on an external HDD, and I use it as a portable install that I can take with me wherever I go. Today I booted it on a friend's iMac, and after Software Updater asked me to install updates. So I did. Since at that point I was…
You'reAGitForNotUsingGit
  • 14,969
11
votes
1 answer

How to check if I'm using GRUB-EFI or GRUB-PC?

I'm running Ubuntu 14.04 in a chroot on ChromeOS, which uses a UEFI system. In order to install WinUSB to create recovery media for Windows, I had to change grub-efi-amd64 to grub-pc. WinUSB performed this process for me. To my knowledge this would…
snazzybouche
  • 262
10
votes
1 answer

Remove Windows entry in GRUB menu

I used to have Windows 8.1 - Linux Mint dual boot. I succesfully removed Windows from the system but Grub still shows Windows in boot options: grub menu I would like to configure the system the way, that on start up I directly load into Linux Mint…
displayname
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10
votes
1 answer

Can I safely remove grub after installing rEFInd?

I use rEFInd for dual-boot with Windows 10 on my PC and I want to remove GRUB because I don't use it and OS boots from rEFInd directly, without GRUB (after rEFInd installation, I removed ubuntu directory from /boot/efi/EFI). Can I do this safely? If…
png2378
  • 205
10
votes
2 answers

grub-install: error: cannot find EFI directory

Device Start End Sectors Size Type /dev/sda1 2048 1050623 1048576 512M EFI System /dev/sda2 1050624 837228543 836177920 398.7G Linux filesystem /dev/sda3 1452748800 1465147391 12398592 5.9G Linux…
Evion Cane
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