11.10 双启动没有 grub 菜单

11.10 双启动没有 grub 菜单

我已经在计算机上安装了 Windows 7,然后安装了 Ubuntu 11.10,但重启时没有出现 grub 菜单,而是直接进入 Windows。

然后我删除了 Ubuntu 创建的分区并尝试了 Fedora 16 - 它创建了略有不同的分区 - 成功了(显示了 grub 菜单)。因为不想保留 Fedora,我格式化了它的分区并在其上安装了 Ubuntu。Grub 仍可加载,但仍然带有 Fedora 选项(显然不起作用)。

当我尝试运行启动修复时,它会警告我:

“您的 PC 启动处于 EFI 模式,但未检测到 EFI 分区。您可能需要在创建 EFI 分区(FAT32、>200Mo、磁盘启动、EFI 标志)后重试”

如果我继续,我将无法运行推荐的修复程序,因为它一直要求我添加 grub2 的软件源,即使它们已经存在。

                     Boot Info Script 0.60-git      [2 Jan 2012]


============================= Boot Info Summary: ===============================

 => Grub2 (v1.99) is installed in the MBR of /dev/sda and looks at sector 1 of 
    the same hard drive for core.img. core.img is at this location and looks 
    for (,msdos3)/grub2 on this drive.
 => Syslinux MBR (4.04 and higher) is installed in the MBR of /dev/sdb.

sda1: __________________________________________________________________________

    File system:       ntfs
    Boot sector type:  Windows Vista/7: NTFS
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files:        /bootmgr /Boot/BCD

sda2: __________________________________________________________________________

    File system:       ntfs
    Boot sector type:  Windows Vista/7: NTFS
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  Windows 7
    Boot files:        /Windows/System32/winload.exe

sda3: __________________________________________________________________________

    File system:       ext4
    Boot sector type:  -
    Boot sector info: 
    Operating System:  
    Boot files:        /grub2/grub.cfg /grub2/core.img

sda4: __________________________________________________________________________

    File system:       Extended Partition
    Boot sector type:  Unknown
    Boot sector info: 

sda5: __________________________________________________________________________

    File system:       ext4
    Boot sector type:  -
    Boot sector info: 
    Operating System:  Ubuntu 11.10
    Boot files:        /boot/grub/grub.cfg /etc/fstab

sda6: __________________________________________________________________________

    File system:       swap
    Boot sector type:  -
    Boot sector info: 

sdb1: __________________________________________________________________________

    File system:       vfat
    Boot sector type:  SYSLINUX 4.05 2011-12-09
    Boot sector info:  Syslinux looks at sector 2652248 of /dev/sdb1 for its 
                       second stage. SYSLINUX is installed in the  directory. 
                       No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files:        /boot/grub/grub.cfg /syslinux/syslinux.cfg 
                       /efi/boot/bootx64.efi /ldlinux.sys

============================ Drive/Partition Info: =============================

Drive: sda _____________________________________________________________________

Disk /dev/sda: 256.1 GB, 256060514304 bytes
255 heads, 63 sectors/track, 31130 cylinders, total 500118192 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

Partition  Boot  Start Sector    End Sector  # of Sectors  Id System

/dev/sda1    *          2,048       206,847       204,800   7 NTFS / exFAT / HPFS
/dev/sda2             206,848   153,602,047   153,395,200   7 NTFS / exFAT / HPFS
/dev/sda3         153,602,048   154,626,047     1,024,000  83 Linux
/dev/sda4         154,628,094   500,117,503   345,489,410   5 Extended
/dev/sda5         154,628,096   492,013,567   337,385,472  83 Linux
/dev/sda6         492,015,616   500,117,503     8,101,888  82 Linux swap / Solaris

我已经尝试了几天,但都没有成功!我想实现 Windows 7 和 Ubuntu 双启动。我不介意重新安装 Ubuntu 或重新创建分区,但我真的陷入困境。

答案1

最终成功了。我确信下面的操作涉及很多不必要的步骤,但它确实有效,也许有人可以指出哪些是不需要的?

sudo mount /dev/sda5 /mnt
sudo mount --bind /dev /mnt/dev
sudo chroot /mnt
sudo grub-install /dev/sda
sudo update-grub

此时,grub 正在加载但显示救援提示(错误:没有这样的分区)

sudo mkdir /media/sda5
sudo mount /dev/sda5 /media/sda5
sudo grub-install --root-directory=/media/sda5 /dev/sda

而且它有效!!

答案2

安装 Windows 后安装 Ubuntu。如果没有显示 grub 菜单,则使用 Ubuntu 可启动 U 盘,从 U 盘启动,然后

grub-install --root-directory=/dev/sda

即使无法启动也不要担心,你还没有丢失任何东西,如果仍然遇到问题,请尝试

grub-install --root-directory=/media/WIN_DIR

WIN_DIR 是安装 Windows 7 的目录。

相关内容