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Perhaps if you have two disks and you use a different operating system, use grub2 on Linux to update the boot state as follows:

First, grub2 will work on the first hard disk without changing the state set in the BIOS.

[Case1. 1Disk - 2 OS   or   2Disk 2 OS]

 # grub2-install /dev/sda
 # grub2-mkconfig -o /boot/grub2/grub.cfg

Sometimes the location of grub.cfg may be different. [/boot/efi/EFI/fedora/grub.cfg ]

 # grub2-install /dev/sda

if the boot settings are correct, you can get new the boot status and will be update for grub2 in boot process

After boot linux, logging in to linux, update grub2 with the command, and let me know the progress so that you can better troubleshoot the problem. Please let me know your results and i will be update further.

Perhaps if you have two disks and you use a different operating system, use grub2 on Linux to update the boot state as follows:

First, grub2 will work on the first hard disk without changing the state set in the BIOS.

[Case1. 1Disk - 2 OS   or   2Disk 2 OS]

 # grub2-install /dev/sda
 # grub2-mkconfig -o /boot/grub2/grub.cfg
/boot/grub2/grub.cfg 
 or 
 # grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg

Sometimes the location of grub.cfg may be different. [/boot/efi/EFI/fedora/grub.cfg ]

 # grub2-install /dev/sda

if the boot settings are correct, you can get new the boot status and will be update for grub2 in boot process

After boot linux, logging in to linux, update grub2 with the command, and let me know the progress so that you can better troubleshoot the problem. Please let me know your results and i will be update further.

Perhaps if you have two disks and you use a different operating system, use grub2 on Linux to update the boot state as follows:

First, grub2 will work on the first hard disk without changing the state set in the BIOS.

[Case1. 1Disk - 2 OS   or   2Disk 2 OS]

 Check the disk status.
 # grub2-install fdisk /dev/sda
 # fdisk /dev/sdb

 # grub2-mkconfig -o /boot/grub2/grub.cfg 
 or 
 # grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg

Sometimes the location of grub.cfg may be different. [/boot/efi/EFI/fedora/grub.cfg ]

 # grub2-install /dev/sda

if the boot settings are correct, you can get new the boot status and will be update for grub2 in boot process

After boot linux, logging in to linux, update grub2 with the command, and let me know the progress so that you can better troubleshoot the problem. Please let me know your results and i will be update further.

Perhaps if you have two disks and you use a different operating system, use grub2 on Linux to update the boot state as follows:

First, grub2 will work on the first hard disk without changing the state set in the BIOS.

[Case1. 1Disk - 2 OS   or   2Disk 2 OS]

 Check the disk status.
status. [fdisk]  p Enter  q Enter
 # fdisk /dev/sda
 # fdisk /dev/sdb

 # grub2-mkconfig -o /boot/grub2/grub.cfg 
 or 
 # grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg

Sometimes the location of grub.cfg may be different. [/boot/efi/EFI/fedora/grub.cfg ]

 # grub2-install /dev/sda

if the boot settings are correct, you can get new the boot status and will be update for grub2 in boot process

After boot linux, logging in to linux, update grub2 with the command, and let me know the progress so that you can better troubleshoot the problem. Please let me know your results and i will be update further.

Perhaps if you have two disks and you use a different operating system, use grub2 on Linux to update the boot state as follows:

First, grub2 will work on the first hard disk without changing the state set in the BIOS.

[Case1. 1Disk - 2 OS   or   2Disk 2 OS]

 Check the disk status. [fdisk] [fdisk /dev/sdX]  p Enter  q Enter
 # fdisk /dev/sda
 # fdisk /dev/sdb

 # grub2-mkconfig -o /boot/grub2/grub.cfg 
 or 
 # grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg

Sometimes the location of grub.cfg may be different. [/boot/efi/EFI/fedora/grub.cfg ]

 # grub2-install /dev/sda

if the boot settings are correct, you can get new the boot status and will be update for grub2 in boot process

After boot linux, logging in to linux, update grub2 with the command, and let me know the progress so that you can better troubleshoot the problem. Please let me know your results and i will be update further.

The first time you boot up, grub2 will appear on your first hard disk, so you should check the disk for confirmation and status. If the grub values are modified and set incorrectly, serious problems may occur.

Perhaps if you have two disks and you use a different operating system, use grub2 on Linux to update the boot state as follows:

First, grub2 will work on the first hard disk without changing the state set in the BIOS.

[Case1. 1Disk - 2 OS   or   2Disk 2 OS]

 Check the disk status. [fdisk /dev/sdX]  p Enter  q Enter
 # fdisk /dev/sda
 # fdisk /dev/sdb

 # grub2-mkconfig -o /boot/grub2/grub.cfg 
 or 
 # grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg

Sometimes the location of grub.cfg may be different. [/boot/efi/EFI/fedora/grub.cfg ]

 # grub2-install /dev/sda

if the boot settings are correct, you can get new the boot status and will be update for grub2 in boot process

After boot linux, logging in to linux, update grub2 with the command, and let me know the progress so that you can better troubleshoot the problem. Please let me know your results and i will be update further.

The first time you boot up, grub2 will appear on your first hard disk, so you should check the disk for confirmation and status. If the grub values are modified and set incorrectly, serious problems may occur.

Perhaps if you have two disks and you use a different operating system, use grub2 on Linux to update the boot state as follows:

First, grub2 will work on the first hard disk without changing the state set in the BIOS.

[Case1. 1Disk - 2 OS or 2Disk 2 OS] OS]

 Check the disk status. [fdisk /dev/sdX] p Enter  q Enter
 # fdisk /dev/sda
/dev/sda             [MS-Windows System]
 # fdisk /dev/sdb

/dev/sdb             [Linux- Fedora System]
or
 # fdisk /dev/sda1            [MS-Windows System]
 # fdisk /dev/sda2            [Linux- Fedora System]

[Case 2. grub2 update and re-install Disk]

 # grub2-mkconfig -o /boot/grub2/grub.cfg 
 or 
or
 # grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg

Sometimes the location of grub.cfg may be different. [/boot/efi/EFI/fedora/grub.cfg ]

 # grub2-install /dev/sda

if the boot settings are correct, you can get new the boot status and will be update for grub2 in boot process

After boot linux, logging in to linux, update grub2 with the command, and let me know the progress so that you can better troubleshoot the problem. Please let me know your results and i will be update further.

The first time you boot up, grub2 will appear on your first hard disk, so you should check the disk for confirmation and status. If the grub values are modified and set incorrectly, serious problems may occur.

Perhaps if you have two disks and you use a different operating system, use grub2 on Linux to update the boot state as follows:

First, grub2 will work on the first hard disk without changing the state set in the BIOS.

[Case1. 1Disk - 2 OS or 2Disk 2 OS]

 Check the disk status. [fdisk /dev/sdX] p Enter  q Enter
 # fdisk /dev/sda             [MS-Windows System]
 # fdisk /dev/sdb             [Linux- Fedora System]
or
 # fdisk /dev/sda1            [MS-Windows System]
 # fdisk /dev/sda2            [Linux- Fedora System]

[Case 2. grub2 update and re-install Disk]

 # grub2-mkconfig -o /boot/grub2/grub.cfg 
 or
 # grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg

Sometimes the location of grub.cfg may be different. [/boot/efi/EFI/fedora/grub.cfg ]

 # grub2-install /dev/sda

Do NOT run grub2-install if you intend to boot in UEFI mode. [ @villykruse ]

if the boot settings are correct, you can get new the boot status and will be update for grub2 in boot process

After boot linux, logging in to linux, update grub2 with the command, and let me know the progress so that you can better troubleshoot the problem. Please let me know your results and i will be update further.

The first time you boot up, grub2 will appear on your first hard disk, so you should check the disk for confirmation and status. If the grub values are modified and set incorrectly, serious problems may occur.

Perhaps if you have two disks and you use a different operating system, use grub2 on Linux to update the boot state as follows:

First, grub2 will work on the first hard disk without changing the state set in the BIOS.

[Case1. 1Disk - 2 OS or 2Disk 2 OS]

 Check the disk status. [fdisk /dev/sdX] p Enter  q Enter
 # fdisk /dev/sda             [MS-Windows System]
 # fdisk /dev/sdb             [Linux- Fedora System]
or
 # fdisk /dev/sda1            [MS-Windows System]
 # fdisk /dev/sda2            [Linux- Fedora System]

[Case 2. grub2 update and re-install Disk]for MBR(Master Boot Record) System]

 # grub2-mkconfig -o /boot/grub2/grub.cfg 
 or
 # grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg

Sometimes the location of grub.cfg may be different. [/boot/efi/EFI/fedora/grub.cfg ]

 # grub2-install /dev/sda

Do NOT run grub2-install if you intend to boot in UEFI mode. [ @villykruse ]]. Use disk to distinguish between mbr and gpt. If UEFI is supported, check gpt when checking the fdisk status.

if the boot settings are correct, you can get new the boot status and will be update for grub2 in boot process

After boot linux, logging in to linux, update grub2 with the command, and let me know the progress so that you can better troubleshoot the problem. Please let me know your results and i will be update further.

The first time you boot up, grub2 will appear on your first hard disk, so you should check the disk for confirmation and status. If the grub values are modified and set incorrectly, serious problems may occur.

Changing from BIOS Legacy Mode to UEFI will cause boot problems, and will force booting of GRUB2 on a system running in UEFI mode.

Perhaps if you have two disks and you use a different operating system, use grub2 on Linux to update the boot state as follows:

First, grub2 will work on the first hard disk without changing the state set in the BIOS.

[Case1. 1Disk - 2 OS or 2Disk 2 OS]

 Check the disk status. [fdisk /dev/sdX] p Enter  q Enter
 # fdisk /dev/sda             [MS-Windows System]
 # fdisk /dev/sdb             [Linux- Fedora System]
or
 # fdisk /dev/sda1            [MS-Windows System]
 # fdisk /dev/sda2            [Linux- Fedora System]

[Case 2. grub2 update and re-install for MBR(Master Boot Record) System]

 # grub2-mkconfig -o /boot/grub2/grub.cfg 
 or
 # grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg

Sometimes the location of grub.cfg may be different. [/boot/efi/EFI/fedora/grub.cfg ]

 # grub2-install /dev/sda

Do NOT run grub2-install if you intend to boot in UEFI mode. [ @villykruse ]. Use disk to distinguish between mbr and gpt. If UEFI is supported, check gpt when checking the fdisk status.

if the boot settings are correct, you can get new the boot status and will be update for grub2 in boot process

After boot linux, logging in to linux, update grub2 with the command, and let me know the progress so that you can better troubleshoot the problem. Please let me know your results and i will be update further.