As for running windows from an external USB drive, I've that before, albeit may be specific to the computer. The directions provided create separate partitions, first to create the Windows partition and install WIN done. In Gavin's post, there were several parts. There are other partitions to be created after this for swap, portable storage, utilities, etc. Trying this.
Add a comment. Active Oldest Votes. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. A value of 0 boots the first menuentry. A value of 1 boots the second menuentry. A value of saved instructs GRUB 2 to load the last successfully loaded operating system. These two commands are described as follows: grub2-set-default : Sets the default entry for all subsequent reboots grub2-reboot : Sets the default entry for the next reboot only.
By default, the first menuentry always lists an option from the installation which is in charge of GRUB 2. The file is the result of various scripts which build the menu in sections, with each script responsible for a specific part of the menu. If the user wishes to create a boot menu with a different name or path, use the full command with the -o switch.
The grub. These sections are more fully explained in the Scripts section. Editing grub. This changed and now the developers acknowledge that sometimes the user may wish to simply edit the file manually.
Because of the automatic changes induced by update-grub however, manual edits are subject to being overwritten by the system. If grub. It is possible to "freeze" the current grub. The versatility of GRUB 2 probably makes this option the least desirable. The parts of grub. The user can make one or more of those scripts non-executable and substitute a custom entry or edit the actual script. Either method allows menu customization while still permitting the system to update GRUB 2.
This configuration file contains information formerly contained in the upper section of GRUB Legacy's menu. While the most common settings are present in the default file, additional environmental settings are available for inclusion in this file. These include items such as backgrounds and themes. The placement of the menu items in the grub.
Files with a leading numeral are executed first, beginning with the lowest number. If files with alphabetic names exist, they are run after the numerically-named files.
Only executable files generate output to grub. Users normally do not need to make changes to this file. In the absence of a splash image, this file sets a monochromatic theme for the initial menu display. This includes the associated recovery mode option if enabled. In GRUB 1. Note: For earlier versions of GRUB 2, all kernels residing in the boot folder are included on the main menu. I found that to be the kernel at index 1 in the list, i.
Additional testing showed that this problem occurred whether using the original grub. I have tried this on both virtual and real hardware and the problem is the same on each. I only tried this with Fedora 25 so it may not be an issue with other Fedora releases. Note that the "recovery" kernel entry that is generated from the "rescue" kernel does work and boots to a maintenance mode login.
This will generate usable recovery entries in the GRUB menu for each of the installed kernels. These recovery configurations work as expected and boot to runlevel 1—according to the runlevel command—at a command line entry that requests a password to enter maintenance mode.
You could also press Ctrl-D to continue a normal boot to the default runlevel. Understanding how to configure GRUB is important to be able to recover from or to circumvent various types of problems. I have had to boot to recovery or rescue mode many times over the years to resolve many types of problems. Hardware compatibility issues might also prevent a specific kernel from booting. As the author says, these programs are used to load and launch Linux, and nothing more.
Thank you for the detailed insight and overview, I am just starting to dwell and learn about Linux booting process. At start, it looked scary but the language and writing tone helped me get some ease :. It is very useful but I want to ask you why this is useful as well as maintainable? Thank you for sharing this knowledge. Learn how the GRUB boot loader works to prepare your system and launch your operating system kernel.
Image by :. Internet Archive Book Images. Modified by Opensource. Get the highlights in your inbox every week. GRUB menu The function of the GRUB menu is to allow the user to select one of the installed kernels to boot in the case where the default kernel is not the desired one.
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