linux - EFI dual boot windows 7 under fedora 23

I recently installed Fedora 23 on my Windows PC, which is running Win 7 Prof 64 bit.

Before that I had a dual boot system with my above Win Sys and OpenSuse which was running after couple of minutes configuring the grub boot loader in yast.

So I created a bootable usb stick and installed fedora like my opensuse with a root-, home- and swap-partition and of course the mountpoint /boot/efi in the efi-partition on my /dev/sda1. (similar to opensuse-installation!)

The Installation was successful without errors and after the first reboot i tried to configure grub and the menu entries. But nothing helped and I'm trying since 2 days every solved forum answers.

for example:

Missing win7 entity

dual boot system using uefi

Rebooting after trying out the above shows up the new MenueEntry.
Booting from this selection gives the following Error:

Missing Signature. You need to load the Kernel first.

After some tryouts to configure some grub menu entrys, booting fedora also threw an error message :

file 'boot/grub2/grubenv' not found

hitting enter ignores the problem and still boots fedora though.

fDisk Output:

fdisk -l
Festplatte /dev/sda: 931,5 GiB, 1000204886016 Bytes, 1953525168 Sektoren
Einheiten: Sektoren von 1 * 512 = 512 Bytes
Sektorgröße (logisch/physikalisch): 512 Bytes / 4096 Bytes
E/A-Größe (minimal/optimal): 4096 Bytes / 4096 Bytes
Festplattenbezeichnungstyp: gpt
Festplattenbezeichner: ADD7D9F2-CF60-40BF-AB36-440D08986EE4
Gerät          Anfang       Ende  Sektoren Größe Typ
/dev/sda1        2048     206847    204800   100M EFI-System
/dev/sda2      206848     468991    262144   128M Microsoft reserviert
/dev/sda3      468992  717268991 716800000 341,8G Microsoft Basisdaten
/dev/sda4   717268992 1434068991 716800000 341,8G Microsoft Basisdaten
/dev/sda5  1434068992 1748721663 314652672   150G Microsoft Basisdaten
/dev/sda6  1748721664 1748725759      4096     2M BIOS boot
/dev/sda7  1748725760 1951543295 202817536  96,7G Linux LVM
Festplatte /dev/sdb: 238,5 GiB, 256060514304 Bytes, 500118192 Sektoren
Einheiten: Sektoren von 1 * 512 = 512 Bytes
Sektorgröße (logisch/physikalisch): 512 Bytes / 512 Bytes
E/A-Größe (minimal/optimal): 512 Bytes / 512 Bytes
Festplattenbezeichnungstyp: gpt
Festplattenbezeichner: 6407EE3B-8043-4E6D-A844-C553572E4C46
Gerät      Anfang      Ende  Sektoren Größe Typ
/dev/sdb1    2048    264191    262144   128M Microsoft reserviert
/dev/sdb2  264192 481243135 480978944 229,4G Microsoft Basisdaten
Festplatte /dev/mapper/fedora-root: 23,3 GiB, 25002246144 Bytes, 48832512 Sektoren
Einheiten: Sektoren von 1 * 512 = 512 Bytes
Sektorgröße (logisch/physikalisch): 512 Bytes / 4096 Bytes
E/A-Größe (minimal/optimal): 4096 Bytes / 4096 Bytes
Festplatte /dev/mapper/fedora-swap: 12,9 GiB, 13828620288 Bytes, 27009024 Sektoren
Einheiten: Sektoren von 1 * 512 = 512 Bytes
Sektorgröße (logisch/physikalisch): 512 Bytes / 4096 Bytes
E/A-Größe (minimal/optimal): 4096 Bytes / 4096 Bytes
Festplatte /dev/mapper/fedora-home: 60,6 GiB, 65003323392 Bytes, 126959616 Sektoren
Einheiten: Sektoren von 1 * 512 = 512 Bytes
Sektorgröße (logisch/physikalisch): 512 Bytes / 4096 Bytes
E/A-Größe (minimal/optimal): 4096 Bytes / 4096 Bytes

other outputs of

lsblk // blkid | grep -i efi // grep -i efi /etc/fstab //
gdisk -l /dev/sdb // ls -l /boot/efi/EFI/ //
grub2-mkconfig /boot/efi/EFI/fedora/grub.cfg // ...

output of various relating commands

Thanks for your help in advance!

Answer

Your GRUB configuration is using BIOS syntax to try to boot Windows. This won't work on an EFI-mode installation, which you seem to have. Broadly speaking, you have two options:

• Fix the GRUB configuration -- Tools like GRUB Customizer are supposed to help with this, although I have no experience with this program, so I can't help beyond pointing you to it. You can tweak it manually, too, as described (among other places) here.


• Switch boot loaders -- About half a dozen EFI boot loaders for Linux exist, so you can switch away from GRUB 2 if it's not working for you. See this page of mine for my detailed thoughts on them. My own rEFInd is likely to be the easiest to install and switch to, should you decide to move from GRUB 2.

The biggest single advantage of GRUB 2 is that it's the default boot loader of most Linux distributions, including both Fedora and OpenSUSE. Thus, these distributions' maintainers put a lot of effort into creating a working configuration. The trouble is that GRUB 2's configuration is rather complex, so when the distribution maintainers' efforts fail, it can be a challenge to fix the problem. You'll have to decide for yourself whether to accept that challenge or to "abandon ship" to something else.