[ERLEDIGT] Grub2 Bootauswahl wird nicht mehr angezeigt

# If you change this file, run 'grub2-mkconfig -o /boot/grub2/grub.cfg' afterwards to update
# /boot/grub2/grub.cfg.
GRUB_DISTRIBUTOR="openSUSE"

GRUB_DEFAULT=0
GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash=silent"
GRUB_CMDLINE_LINUX=""

# Uncomment to automatically save last booted menu entry in GRUB2 environment
# variable `saved_entry'
#GRUB_SAVEDEFAULT="true"

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_LINUX_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"
GRUB_BACKGROUND=/boot/grub2/themes/openSUSE/background.png
GRUB_THEME=/boot/grub2/themes/openSUSE/theme.txt

PS C:\Users\Admin> \Windows\system32>bcdedit /enum all
Die Benennung "\Windows\system32>bcdedit" wurde nicht als Name eines Cmdlet, einer Funktion, einer Skriptdatei oder ein
es ausführbaren Programms erkannt. Überprüfen Sie die Schreibweise des Namens, oder ob der Pfad korrekt ist (sofern ent
halten), und wiederholen Sie den Vorgang.
Bei Zeile:1 Zeichen:26
+ \Windows\system32>bcdedit <<<<  /enum all
    + CategoryInfo          : ObjectNotFound: (\Windows\system32>bcdedit:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. Alle Rechte vorbehalten.

C:\Users\Admin>cd \Windows\system32

C:\Windows\System32>bcdedit /enum all

Windows-Start-Manager
---------------------
Bezeichner              {bootmgr}
device                  partition=\Device\HarddiskVolume1
description             Windows Boot Manager
locale                  de-de
inherit                 {globalsettings}
default                 {current}
resumeobject            {6541d410-5a58-11e4-a75f-da77fe53f6f7}
displayorder            {current}
toolsdisplayorder       {memdiag}
timeout                 30

Windows-Startladeprogramm
-------------------------
Bezeichner              {current}
device                  partition=C:
path                    \Windows\system32\winload.exe
description             Windows 7
locale                  de-de
inherit                 {bootloadersettings}
osdevice                partition=C:
systemroot              \Windows
resumeobject            {6541d410-5a58-11e4-a75f-da77fe53f6f7}
nx                      OptIn

Wiederaufnahme aus dem Ruhezustand
----------------------------------
Bezeichner              {6541d410-5a58-11e4-a75f-da77fe53f6f7}
device                  partition=C:
path                    \Windows\system32\winresume.exe
description             Windows Resume Application
locale                  de-de
inherit                 {resumeloadersettings}
filedevice              partition=C:
filepath                \hiberfil.sys
debugoptionenabled      No

Windows-Speichertestprogramm
----------------------------
Bezeichner              {memdiag}
device                  partition=\Device\HarddiskVolume1
path                    \boot\memtest.exe
description             Windows-Speicherdiagnose
locale                  de-de
inherit                 {globalsettings}
badmemoryaccess         Yes

EMS-Einstellungen
-----------------
Bezeichner              {emssettings}
bootems                 Yes

Debuggereinstellungen
---------------------
Bezeichner              {dbgsettings}
debugtype               Serial
debugport               1
baudrate                115200

RAM-Defekte
-----------
Bezeichner              {badmemory}

Globale Einstellungen
---------------------
Bezeichner              {globalsettings}
inherit                 {dbgsettings}
                        {emssettings}
                        {badmemory}

Startladeprogramm-Einstellungen
-------------------------------
Bezeichner              {bootloadersettings}
inherit                 {globalsettings}
                        {hypervisorsettings}

Hypervisoreinstellungen
-------------------
Bezeichner              {hypervisorsettings}
hypervisordebugtype     Serial
hypervisordebugport     1
hypervisorbaudrate      115200

Einstellungen zur Ladeprogrammfortsetzung
-----------------------------------------
Bezeichner              {resumeloadersettings}
inherit                 {globalsettings}

C:\Windows\System32>

su -c "mkdir /mnt/dev"

grub2-install /dev/sda

grub2-install /dev/sda
Installing for i386-pc platform
grub2-install: error cannot find a device for /boot/grub2 (is /dev mounted?)

mkdir /mnt/dev

mkdir cannot create directory /mnt/dev: File exists

mount|grep '\/dev'
cat /etc/fstab

mount | grep "\/dev"

/dev/loop0 on /parts/mp_000 type squashfs (ro,relatime)
/dev/loop1 on /parts/mp_001 type squashfs (ro,relatime)
devtmpfs on /dev type devtmpfs (rw,relatime,size=3615192k,nr_inodes=903798,mode=755
/dev/loop2 on /parts/mp_000 type squashfs (ro,relatime)
/dev/loop3 on /parts/mp_001 type squashfs (ro,relatime)
/dev/loop4 on /parts/mp_002 type squashfs (ro,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620,ptmxmode=000)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
hugetlbfs on /dev/mqueue type hugetbfs (rw,relatime)
mqueue on /dev/mqueue type mqueue (rw,relatime)

cat /etc/fstab

/dev/root / ext2 defaults 0 0
proc /proc proc defaults 0 0
sysfs /sys sysfs noauto 0 0
devpts /dev/pts devpts mode=620,gid=5 0 0