现在 Windows 8 在启动加载时不显示,但几天前显示过

现在 Windows 8 在启动加载时不显示,但几天前显示过

在我的计算机上,我有Windows 8Ubuntu 20.04。一切进展顺利。开机或重启时,我有两个选项可供选择(Windows 或 Ubuntu)。

由于 COVID-19,我安装了 AnyDesk(一款远程桌面软件)以便在家工作。AnyDesk 显示了一些错误,在搜索GoogleStackOverflow等等之后,我在 BIOS 上做了一些更改。我忘记了更改了什么。

现在开机的时候没有选项Windows,系统直接加载为Ubuntu。

我浏览了askubuntu关于此问题的所有帖子(例如,,,how to add windows in the grubos-proberupdate-grub,并应用了建议的答案。但没有任何效果。甚至我尝试了该Boot Repair软件(没有成功)。

的输出sudo fdisk -l

Device         Start        End    Sectors  Size Type
/dev/sda1       2048     264191     262144  128M Microsoft reserved
/dev/sda2     264192  782446591  782182400  373G Microsoft basic data
/dev/sda3  782446592  783497215    1050624  513M EFI System
/dev/sda4  783497216 3907028991 3123531776  1.5T Linux filesystem

的输出sudo update-grub

Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/init-select.cfg'
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-5.11.0-27-generic
Found initrd image: /boot/initrd.img-5.11.0-27-generic
Found linux image: /boot/vmlinuz-5.11.0-25-generic
Found initrd image: /boot/initrd.img-5.11.0-25-generic
Adding boot menu entry for UEFI Firmware Settings
done

Boot Repair该软件的部分输出

============================ Boot Info After Repair ============================

 => No boot loader is installed in the MBR of /dev/sda.
 => Windows 7/8/2012 is installed in the MBR of /dev/sdb.

sda1: __________________________________________________________________________

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

sda2: __________________________________________________________________________

    File system:       ntfs
    Boot sector type:  Windows 8/2012: NTFS
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files:        

sda3: __________________________________________________________________________

    File system:       vfat
    Boot sector type:  FAT32
    Boot sector info:  No errors found in the Boot Parameter Block.
    Operating System:  
    Boot files:        

sda4: __________________________________________________________________________

    File system:       ext4
    Boot sector type:  -
    Boot sector info: 
    Operating System:  Ubuntu 20.04.1 LTS
    Boot files:        /boot/grub/grub.cfg /etc/fstab /etc/default/grub

sdb1: __________________________________________________________________________

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

sdb2: __________________________________________________________________________

    File system:       ntfs
    Boot sector type:  Windows 7/2008: NTFS
    Boot sector info:  According to the info in the boot sector, sdb2 has 
                       2742886399 sectors, but according to the info from 
                       fdisk, it has 15627788287 sectors.
    Operating System:  
    Boot files:        

Boot Repair软件 的完整输出文件链接

您可以看到,Windows 位于,sda2但是当我使用时,sudo update-grub它并未添加到启动菜单中。

非常感谢您的任何建议。

更新

如果我按下F12,我会得到 2 个选项UbuntuWindows boot manager。从Windows boot manager我可以开始Windows。现在,是否可以在grub不按下 的情况下从 获得 2 个选项F12?请参阅附图。

F12 选项

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