Сначала проверьте, существуют ли ваши разделы Windows.
Возможно, вы изменили некоторые настройки в BIOS?
Или используйте boot-repair: https://help.ubuntu.com/ сообщество / Boot-Repair
Это известное ограничение. Файл вашего устройства должен находиться в том же разделе, что и ваша корневая файловая система. См. [F2]:
link PATH...
Link a unit file that is not in the unit file search paths into the
unit file search path. This command expects an absolute path to a
unit file. The effect of this may be undone with disable. The
effect of this command is that a unit file is made available for
commands such as start, even though it is not installed directly in
the unit search path. The file system where the linked unit files
are located must be accessible when systemd is started (e.g.
anything underneath /home or /var is not allowed, unless those
directories are located on the root file system).
Это известное ограничение. Файл вашего устройства должен находиться в том же разделе, что и ваша корневая файловая система. См. [F2]:
link PATH...
Link a unit file that is not in the unit file search paths into the
unit file search path. This command expects an absolute path to a
unit file. The effect of this may be undone with disable. The
effect of this command is that a unit file is made available for
commands such as start, even though it is not installed directly in
the unit search path. The file system where the linked unit files
are located must be accessible when systemd is started (e.g.
anything underneath /home or /var is not allowed, unless those
directories are located on the root file system).