Where is grub2 installed

On a single disk you shall always run grub-install from a single OS only! That's important, otherwise you will keep overwriting your config. Just to clarify: You're using grub2 , correct? In case Grub2 is installed in its own boot partition, you don't need to change anything. When it is not which would be really strange , then you could technically retain the grub. If you run mount and see something like this:. You have Grub2 installed in its own partition, as it should be.

Normally, when installing a new distro, the wizzard will usually guide you through the installation process, and even figure out what partitions contain what OS-es, if applicable.

The process on Arch is a bit more tedious but very well documented. At this point I'm not sure if partitions need to be all mounted for Grub2 to detect the OS-es on them, though. If you tried to install Windows in the mean time, it might be Windows overwrote the boot loader.

To fix that, simply run as root or with sudo :. Grub2 is a Stage-2 boot loader. Meaning it's not exactly an operating system, but it's much more complex, than a simple chainloader, which would fit into the first bytes on your primary partition the rest of the first sector is partition table, flags, etc.

Grub2 then either chainloads into another partition for booting windows for instance, as it installs its own boot loader , but it can also run code things like memtest , or access and run a kernel and module image vmlinuz.

What's important to note, is that in both instances Grub2 is unloaded from memory once a kernel starts running, or another partition has been chainloaded. Grub is not tied to a particular OS. It can reside on its private partition, though usually it's installed along the main file system. But for it to be able to boot your system s , it needs to know about them.

So you need to update Grub after any important changes in the systems present on your machine like a new OS installed or a kernel upgrade.

If you delete the only Grub there is, you will not boot your system s. There can be many Grubs on one machine, but only one is main, or active. Apart from Grub, there are other boot loaders that can be used instead of Grub.

Windows has its own boot loader, which can be set as the main one for the whole machine. Sign up to join this community. The best answers are voted up and rise to the top.

Manual changes can be overwritten with grub2-mkconfig when the system gets upgraded with Anaconda. The procedure consists of four parts. To create such a partition:. When you power on your system, your firmware will look for EFI variables that tell it how to boot. On running systems, which have booted into the EFI mode and their EFI runtime services are working correctly, you can configure your boot menu with efibootmgr.

If not, shim can help you bootstrap. The shim command provides its own BOOT. CSV file that will add an entry for grub2-efi. During the boot process, you can use the EFI Shell to invoke the fallback. EFI , which will, in turn, invoke fallback. CSV to create new entries with different names. If you can, it is advisable to install non-Linux operating systems first.

Then, during the installation process, all those operating systems and their locations will be discovered and properly set. Adding other records into the GRUB2 menu only means to run grub2-mkconfig command to regenerate the configuration files. During this process, all operating systems known to the system will be added into the configuration. When problems appear, see the GRUB manual to solve issues with booting secondary operating systems.

To change the default layout, we need to set the default based on the name or title. In that case, set the number of the default operating system using the set default variable. If you edit the configuration file manually, the settings will be overwritten each time the grub2-mkconfig command runs. Sometimes, especially after a secondary operating systems has been installed, the master boot record gets damaged which then prevents the original Linux system from booting.

If this happens, it is necessary to reinstall GRUB2 to recreate the original settings. The process not only discovers all installed operating systems, but usually adds them to the GRUB2 configuration files, so they will all become bootable by GRUB2.

Examine the partition layout and identify the boot and the root partition. That was odd. I tried it, it gave me error messages as suggested it might, then the PC started saying that the app was not suitable for this version of Windows….

Check your device. There is only a grubenv file there. Do I need to create it? I used to use grub legacy for multiboot usb and it was so easy to set it up but this , i am not able to sept it up. Also please kindly tell how can i set multiple iso files to boot u from grub2. If there was any video to show me up then i t would have been amazing. I found super grub2 too but it was confusing me. You need to specify the exact number of the disk that you want to install.

You need to do your own research to boot ISO from Grub2. You can search by keywords: grub2 ubuntu iso boot grub2 linux mint iso boot grub2 arch linux iso boot …. Grub2 is a very powerful boot loader, developed by GNU. You can easily install Grub2 from Windows with just a few commands. Install Grub2 We will now start installing Grub2. Run Command Prompt under Admin and go to the grub Run diskmgmt. G: is the drive of one of the partitions of the hard disk above.