after ubuntu install, to fix win boot item missing issue in the ubuntu grub

step:

1,sudo vi /etc/default/grub

2,

将以下行：

GRUB_TIMEOUT_STYLE=hidden

GRUB_TIMEOUT=0

# GRUB_DISABLE_OS_PROBER=false

修改为：

GRUB_TIMEOUT_STYLE=menu

GRUB_TIMEOUT=5

GRUB_DISABLE_OS_PROBER=false

3,

sudo update-grub