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Adding other operating systems to the GRUB2 menu
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. By reinstalling *GRUB2* into the MBR, this configuration will be used for further boots.
Before you start
# grub2-install /dev/sda
# grub2-mkconfig -o /boot/grub2/grub.cfg
Install *GRUB2* into the MBR of your primary hard disk.
Make sure that the operating systems are on disks, connected to the system.
More information
Normally, *GRUB2* is preset to boot multiple operating systems during the Fedora installation process. 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.
Procedure Procedimento
Recreate the *GRUB2* configuration file.
The `grub2-mkconfig` command will add entries for all operating systems it can find.
When problems appear, see the link:https://www.gnu.org/software/grub/manual/grub/grub.html#Multi_002dboot-manual-config[GRUB manual] to solve issues with booting secondary operating systems.
You have the `os-prober` package installed.