Questions tagged [uefi]
Questions about the Unified Extensible Firmware Interface (UEFI), the software interface aiming to replace typical BIOSes. This tag may also be used for questions related to UEFI partitions and systems.
1,101 questions
1 vote
0 answers
54 views
Why is my unsigned BOOTX64.EFI able to boot with Secure Boot enabled?
I am trying to understand Secure Boot and what it is doing on my system. I am using systemd-boot as my bootloader, not shim or GRUB, and Secure Boot is reported as enabled: running mokutil --sb-state ...
- 11
0 votes
1 answer
41 views
Question about EFI partitions and dual booting
I have a dual-boot laptop: W10 and Linux (Mint 22.2). But recently I've decided to switch to Linux-only and to use VirtualBox with a Win10 guest OS, because there are about 2 apps (in particular ...
- 1,226
1 vote
1 answer
66 views
Qemu: EFI stub: ERROR: Failed to decompress kernel
I created a raw disk image with qemu-img and created an EFI and an EXT4 filesystem on it with losetup, fdisk, mkfs.vfat and mkfs.ext4. As a quick hack, because I couldn't find efi shell on the laptop ...
- 131
0 votes
0 answers
93 views
Cannot boot Ubuntu 24 on a Carbon X1 Lenovo thinkpad
I have a Thinkpad X1 Lenovo on Windows which I want to convert to Linux. I have ubuntu-24.04.3-desktop-amd64.iso on a usb stick using Ventoy. I start the laptop, press F12, install Ubuntu with the ...
- 101
0 votes
0 answers
45 views
`Lenovo T470`. `Linux Mint 21.3`. System Firmware (`UEFI DBX`) update fails due to older version (1.7.9 instead of 1.9.1) of `fwupd` package in `apt`
Title: Lenovo T470. Linux Mint 21.3. System Firmware (UEFI DBX) update fails due to older version (1.7.9 instead of 1.9.1) of fwupd package in apt. Issue: Unable to update System Firmware (...
- 1
0 votes
2 answers
640 views
explanation of all Linux's /boot/efi .efi files
In a simple install of Redhat from rhel-8.10-x86_64-dvd.iso I have this /boot/efi/EFI/BOOT/BOOTX64.EFI /boot/efi/EFI/BOOT/fbx64.efi /boot/efi/EFI/redhat/grubx64.efi /boot/efi/EFI/redhat/mmx64.efi /...
- 9,175
0 votes
0 answers
80 views
GRUB disappears from UEFI boot entries after booting Windows (Ubuntu + Windows dual boot)
Every time I boot into Windows (11/10) on my dual-boot system, the GRUB entry vanishes from the UEFI boot menu. I reinstall GRUB from a live Kali USB, and the entry comes back. Then I reboot into ...
0 votes
1 answer
114 views
RHEL8 dracut initramfs switch-root hanging on one machine and not others
I have a 2TB external SSD connected to a server. Using the server, I booted into the RHEL8 installer and successfully installed onto the external drive, however during the post-install reboot (and all ...
