Managing EFI Boot Loaders for Linux: Repairing Boot Repair. Originally written: 4/2. This Web page is provided free of charge and with no annoying. I did take time to prepare it, and Web hosting does. If you find this Web page useful, please consider making a.

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2. Extensive tutorial about how to setup and configure GRUB 2 (version 2, the next generation) bootloader with multiple operating systems, including GRUB legacy and GRUB.
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Donate $1. 0. 0. 0Donate another value. Archival Note: This page is largely obsolete because of changes in Boot Repair's default options. Specifically, Boot Repair no longer automatically performs the . Nonetheless, I'm leaving this page in place both as a warning to not use that option unless you're reasonably certain it's necessary and as a cautionary tale to be careful about over- application of fixes that are necessary in only a few cases. This page is part of my Managing EFI Boot Loaders.

Linux document. If a Web search has brought you to this page, you. Ubuntu's Boot Repair tool is a user- friendly GUI program that's intended to fix a wide variety of boot issues.

This howto shows how to use the new tools preupgrade assistant and redhat-upgrade-tool to upgrade from CentOS 6.5 to CentOS 7. This HowTo walks you through the steps required to security harden CentOS 7, it’s based on the OpenSCAP benchmark, unfortunately the current version of OpenSCAP.

Although it often works, its user interface is intentionally very simple, and it therefore often does more than is necessary. In an EFI context, this can create new problems, particularly if you don't want to use Ubuntu's version of GRUB 2. This page will help you overcome these problems. Boot Repair provides a simple user interface to a tool that is in fact extremely complex.

Boot Repair presents a simple user interface with just a few options in its main window, as shown to the right. Most users, confronted with a computer that's not booting one or more OSes, will naturally click the button labeled Recommended Repair.

Experts might click Advanced Options to see what else is available—but the result is a dialog box with a plethora of options that can be a little unclear even to an expert. To understand what Boot Repair does (and, in some cases, does wrong), I prerformed an experiment.

Bootloader Install Failed Centos 7 Change

I began by doing a fresh installation of Ubuntu 1. Virtual. Box environment.

I then installed two copies of r. EFInd on the virtual computer: Once as the fallback boot loader and a second copy as a stand- in for the Windows boot loader. The result was the following boot loader files in the EFI System Partition (ESP). EFI/BOOT/bootx. 64. EFI/Microsoft/Boot/bootmgfw. EFI/ubuntu/grubx.

The copy of grubx. Ubuntu installer, and did work; however, because of a quirk of Virtual. Box, its (virtual) NVRAM entries tend to be forgotten, so I needed to select grubx. Virtual. Box's EFI user interface to boot Ubuntu the first time. Thereafter, I installed r. EFInd as EFI/BOOT/bootx.

I also installed a copy of r. EFInd as EFI/Microsoft/Boot/bootmgfw. Windows. With this system in place, I ran Boot Repair.

The number of boot loaders on the ESP doubled. EFI/BOOT/bkpbootx. EFI/BOOT/bootx. 64. EFI/Microsoft/Boot/bkpbootmgfw. EFI/Microsoft/Boot/bootmgfw. EFI/Microsoft/Boot/bootx. EFI/ubuntu/grubx.

By default, Boot Repair replaces both EFI/BOOT/bootx. EFI/Microsoft/Boot/bootmgfw. GRUB, renaming the original files so that they can be accessed or restored. It also places a copy of GRUB as EFI/Microsoft/Boot/bootx. Thus, after running Boot Repair, the number of copies of GRUB on the ESP quadrupled, from one to four! The reason for placing GRUB in these extra locations is to work around problems with a handful of buggy firmware implementations that ignore or forget their NVRAM entries.

In fact, Virtual. Box qualifies as one of these implementations, so if I'd run Boot Repair on the system before installing r. EFInd, Boot Repair would have done the right thing. The main problem with this approach is that it's blind. Many EFI boot problems are not caused by buggy firmware that can't remember NVRAM settings. In such cases, adding three extra boot loader files to the ESP just adds clutter that makes it harder for a human to figure out what's going on.

Other boot managers, such as r. EFIt, r. EFInd, and even other distributions' copies of GRUB, may end up with menus that are cluttered with extra boot options, as well. Furthermore, the boot entries don't always work. When I rebooted my Virtual. Box machine, GRUB presented the following options.

Advanced options for Ubuntu. Windows UEFI bkpbootmgfw. EFI/boot/bkpbootx. EFI/boot/drivers. In my efforts to read the text, though, I tried these options repeatedly, and after about ten or fifteen tries, r. EFInd appeared! Judging by posts I've seen on Web forums, the Windows boot loader often doesn't fare any better—many users report being unable to launch Windows from GRUB after running Boot Repair. The GRUB entry for ext.

Even then, though, the result is extra boot entries. One other problem with juggling EFI boot files deserves mention: Windows can undo it. I've seen reports to the effect that Windows will reverse these changes when it boots, rendering Boot Repair's efforts moot. If you run into such problems, you should probably use one of the alternative methods of registering a boot loader with the EFI mentioned on my page on installing EFI boot loaders.

The use of Windows' own bcdedit program seems particularly likely to work in such cases, according to reports I've seen on Web forums. To be sure, this problem doesn't always crop up, but it does with enough regularity that it's a real problem. Of course, Boot Repair does more than simply juggle EFI files around: It completely re- installs GRUB and generates a new grub.

The Advanced Options menu enables you to add kernel options, enable or disable Secure Boot support, and more. These capabilities can be worthwhile. In fact, if you check the Main tab of the Advanced Options menu, you'll see a setting that controls the creation of those backup files, as shown here: The Backup and Rename EFI Files option is set by default, and it's the culprit behind the overzealous renaming of files. If you're having problems with GRUB configuration but are not having problems launching GRUB, I strongly recommend that you uncheck this option before letting Boot Repair do its thing. I can offer no advice on fixing problems with launching Windows or another boot loader from a version of GRUB that's been adjusted by Boot Repair, except to try another boot manager. As you can tell if you've read my GRUB 2 page, I'm not a big fan of GRUB 2. Other boot loaders have been much more reliable, in my experience.

If you've wound up with the backup boot loader files described on this page and you want to return to the original setup, Boot Repair does offer an option to do this: It's the Restore EFI Backups option on the Main Options tab of the Advanced Options menu (shown earlier). Check that box (Backup and Rename EFI Files will automatically uncheck itself) and click Apply. This will cause Boot Repair to restore the files that were originally present. This can help you if Boot Repair has, as in my demonstration, hijacked a boot manager or boot loader that you actually wanted to run first. It can also help if you've installed r.

EFIt or r. EFInd and you want to trim the boot options in that boot loader's menu. Dwg To Pdf Converter Free Downloads. You can, of course, do a similar repair manually. As I write, Boot Repair renames files so that the originals have bkp prepended to their names. Previous versions of the utility have used other naming conventions, though, such as adding a secondary . You may need to peruse your files and make an educated guess about how they've been renamed. If in doubt, move or rename the bootx.

You can then rename the backup files to their original names. Note also that you might not have both bootx. Once you've juggled the files to restore them to what you hope to be the correct state, you may need to type sudo update- grub or sudo grub- mkconfig - o /boot/grub/grub. GRUB configuration file. The reason this may be necessary is because the GRUB configuration file created by Boot Repair includes references to the backup files, which you probably want to excise. Re- creating the configuration file using GRUB's own scripts should do this.