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grubby が 'error opening /boot/grub/grub.cfg for read' で失敗する理由

Solution In Progress - Updated 2026-02-24T06:35:19+00:00 -

grubby コマンドはブートローダーエントリーのリスト表示に失敗します。
```
# grubby --info ALL
error opening /boot/grub/grub.cfg for read: No such file or directory
```

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