By Jacob M.. I’m trying to run the repair bootloader from a live CD of Ubuntu 16.04. When I run the repair bootloader with repair-bootloader, it results in: “The current session is in Legacy mode.Please reboot the computer, and use this software in an EFI session.”
I just bought a generic laptop ASUS R417NA. I am trying to remove windows 10. However so far I was unable to get into BIOS or UEFI. I tried to disable pretty much every windows boot related
Jan 09, 2018 · With a disk inserted into the CD/DVD drive, or USB stick that contains the EFI/boot/bootx64.efi file, they will show up in the UEFI Bios boot menu and you can manually select which device you want to boot from .
|SSD not in BIOS boot option||Nov 08, 2017|
|boot windows on usb uefi||Sep 18, 2014|
What is Legacy Boot Mode. With newer Windows 8 PCs that are designed with UEFI support, the BIOS or firmware often has an option that specifies if the computer can boot into regular operating systems and recovery tools, or if it can boot exclusively into newer UEFI operating systems and environments.
Unable to boot newly installed Ubuntu 16.04 using UEFI mode? 0. Booting 16.04 into EFI session from ASUS UEFI Bios. 2. Converting Ubuntu 16.04 legacy mode to UEFI mode. 2. Ubuntu on portable SSD – choosing between UEFI and Legacy. 0. Can I run an actual installed ubuntu as a Live session.
Removing Ubuntu from UEFI Bios Menu. Ask Question. Which commands to convert a Ubuntu BIOS install to EFI/UEFI without boot-repair on single boot hardware? to select BOOT ORDER IN UEFI. 1. I have two Ubuntu boot entries, and when I try to remove one, it automatically comes back. 0. Booting 16.04 into EFI session from ASUS UEFI Bios. 2
You can do this easily using Visual BCD Editor in Windows 7/8/10. Map EFI System drive to Z: using mountvol z: /s Run Visual BCD Editor and select “Store”,”Backup store”. a)Click on browse icon in dialog and using the explorer window select
z: drive – now you have full access to EFI System Partition (ESP). b)Click on EFI folder to expand – you will see “Boot”, “Microsoft”
and “ubuntu” folders if you have Windows and Ubuntu installed. c) You can delete “ubuntu” directory by selecting it and pressing
“Del” key. In Visual BCD Editor click on loader entry “Ubuntu” to select it and then press “Del” key to delete. After reboot Ubuntu boot option in UEFI boot menu will be completely gone. Note : You could alternatively use bcdedit.exe to delete EFI boot entry for Ubuntu and use command prompt to delete “ubuntu” folder from EFI System Partition (drive z:) if you feel more comfortable with commands.3Try this: Download the USB flash drive or CD-R version of rEFInd. Prepare a medium with rEFInd, as per the instructions in the files you download. Boot the rEFInd medium you prepare. Use rEFInd to launch an EFI shell. Use the bcfg command in the EFI shell to review your boot options. ( bcfg boot dump -v should do the trick.) Once you’ve identified your Ubuntu boot option, use the bcfg command to remove it, as in bcfg boot rm 3 if the Ubuntu entry is #3 in the list. The bcfg command is described in more detail several places on the Internet, such as here. That particular page is mostly concerned with adding an entry, but it does cover some other commands. Note also that you might not need rEFInd. Some EFIs include a built-in shell that you can launch in some other way, such as from the firmware’s own built-in boot manager; or you can prepare a boot medium that launches an EFI shell directly. I recommended rEFInd simply because the rEFInd USB flash drive and CD-R images include a shell and a way to control that shell’s launch. (Note that you will not get the shell if you install rEFInd to your hard disk, unless you install a shell separately.)2If your System’s EFI is equipped to do this, then you can actually resolve it without needing any kind of bootable media. Firstly, some clarification: Your system does not have a BIOS. UEFI is a complete replacement for BIOS. The screen you enter when you hit DEL or ESC or F1 (or whatever your special key is) is called “system setup” or “system configuration” or “firmware configuration”. Your system Does have a CSM or Compatibility Support Module more commonly referred to as Legacy Mode. Lenovo makes some really feature-filled firmware. One of those features is that EFI boot options are stored within the firmware as they are installed. When you or your OEM installed Windows 8, the Windows installer told your UEFI where its boot files are stored and to create an entry pointing to it. When you installed Ubuntu, GRUB did the same thing. It communicated with the UEFI during installation and told it where its boot files were and to add an entry as well. Now for the irony : Ubuntu, like most other OS’s does not have an ‘uninstaller’. The usual method of removing an OS is to delete its partition, or format it, or what have you. So when you delete or otherwise remove an OS the UEFI is never notified. It doesn’t know that the OS is no longer there. If you boot with F12 or whatever your key is to select your boot device, it still presents you with it’s pointer. So when you go and do a system reset (‘refresh’ works differently) with Windows 8, it literally reinstalls Windows 8 from the recovery partition. During this installation, the Windows installer probes the UEFI and asks it ‘what other OS’s are installed?’ so that it can populate the Windows 8 bootloader with the other OS’s. But as you’ve probably already guessed, your UEFI’s list is incorrect. So here’s what you do: If you have this option in your system setup, you can navigate to the boot section and it should list all available boot devices including the EFI boot options. You should be able to select them and remove them. Fixing the Windows 8 boot list then is trivial. You can just do another reset. If you can’t remove the boot options, you may have an option under ‘Secure Boot’ to reinstall security keys. If you select this option, you will need to reinstall windows again, but normally the UEFI will also delete the EFI boot list in the process. Try it and see what works for you.2The easiest way to remove “Ubuntu option” from boot menu of your laptop is from within Windows. Install EasyUEFI in Windows and you can remove/edit or change the order of all EFI partition entries.1To manually open an efi partition from windows launch diskpart from the command line, then do the following; list volume select volume 5 (volume 5 is the efi partition in my case) assign This will mount the EFI partition.Now we have to kill windows explorer and launch it (in admin mode in cmd) from a elevated platform for that taskkill /im explorer.exe /f
now you can open the mounted volume 5 by simply double clicking on it.For this you need to install ubuntu again. After installing open terminal and login as root using command: sudo -i
Enter your password, then navigate to root/efi/EFI and delete all directories in it and finally delete the EFI folder and efi. Now ubuntu will be removed from your boot menu. Finally delete the ubuntu partitions from windows partition manager.
Secure Boot is often enabled by default on ASUS motherboards with UEFI BIOS. I have Windows 10 on my new PC right now and wanted to have a dual-boot setup. For that, I needed to disable the secure boot on the machine.
UEFI (Unified Extensible Firmware Interface) is a standard firmware interface for new PCs pre-installed with Windows 8/10, which is designed to replace BIOS (basic input/output system). If your computer has not been installed with Windows 8 and 10, just need to follow traditional method to boot computer from USB device or CD-ROM.
Choose UEFI or legacy BIOS modes when booting into Windows PE (WinPE) or Windows Setup. After Windows is installed, if you need to switch firmware modes, you may be able to use the MBR2GPT tool. In general, we recommend installing Windows using the newer UEFI mode , as it includes more security features than the legacy BIOS mode.
Booting from a USB or CD/DVD drive can be tricky depending on your computer’s BIOS / UEFI setup. In this guide, we’ll break it down step-by-step.