Восстановление GRUB (grub rescue) Опции

[Decker]

Grub не загружается с сообщением:

Код

grub rescue >

Необходимо подключение остальной части загрузчика

Вводим команду ls и наблюдаем следующее:

Код

(hd0) (hd0,2) (hd0,3) (hd0,5) (hd0,6)

А теперь set:

Код

prefix=(hd0,6)/boot/grubroot=(hd0,6)

Устанавливаем правильный раздел:

Код

set prefix=(hd0,5)/boot/grubset root=(hd0,5)

Теперь смотрим доступные моды и подгрузим необходимые нам:

Код

ls /boot/grub
insmod /boot/grub/linux.mod
insmod /boot/grub/normal.mod

Модули можно подгружать и так:

Код

insmod normal

Теперь вбиваем команду normal и попадаем в меню загрузки граба:

Код

normal

После того как вы попадете в систему, выполните:

Код

sudo upgrade-from-grub-legacy

p.s. Официальный мануал - https://help.ubuntu.com/community/Grub2

p.p.s. GRUB vs GRUB 2

GRUB 2's default menu will look familiar to GRUB users but there are a great number of differences beneath the surface.

1. On a new installation of Ubuntu 9.10 or later with no other installed operating systems, GRUB 2 will boot directly to the login prompt or Desktop. No menu will be displayed.
2. Hold down SHIFT to display the menu during boot. In certain cases, pressing the ESC key may also display the menu.
3. No /boot/grub/menu.lst. It has been replaced by /boot/grub/grub.cfg.
4. There is no "/find boot/grub/stage1" at the grub prompt. Stage 1.5 has been eliminated.
5. The main Grub 2 configuration file, normally located in the /boot/grub folder, is grub.cfg. It is the product of various scripts and should not normally be edited directly.
6. grub.cfg is overwritten by certain Grub 2 package updates, whenever a kernel is added or removed, or when the user runs update-grub.
7. The menu list of available Linux kernels is automatically generated by running update-grub.
8. The user can create a custom file in which the user can place his own menu entries. This file will not be overwritten. By default, a custom file named 40_custom is available for use in the /etc/grub.d folder.
9. The primary configuration file for changing menu display settings is called grub and by default is located in the /etc/default folder.
10. There are multiple files for configuring the menu - /etc/default/grub mentioned above, and all the files in the /etc/grub.d/ directory.
11. Partition numbering has changed. The first partition is now 1 rather than 0. The first device/drive is still hd0 by default (no change). These designations can be altered if necessary in the device.map file in the /boot/grub folder.
12. Automated searches for other operating systems, such as Windows, are accomplished whenever update-grub is executed. Operating systems found will be placed in the Grub 2 menu.
13. Changes made in the configuration files will not take effect until the update-grub command is executed.

Полезные ссылки:
Установка Grub 2 в Ubuntu 9.04 и фоновой картинки на него!
[HOWTO] Настройка и редактирование GRUB 2 (там раздел "загрузка системы при частичной неработоспособности GRUB2")