我在原来启动盘/dev/sda中多分出来一个分区/dev/sda3
然后把/dev/sda3 挂载到/boot上（原来没有/boot挂载点的）
然后执行
```
sudo grub-probe -t devicie /boot/grub
sudo grub-install /dev/sda
sudo grub-install --recheck /dev/sda
```
等都么有报错，然后执行`sudo update-grub`时报错
```
mount: /dev/sda3 is already mounted or /boot busy
/dev/sda3 is already mounted on /boot
Installing for i386-pc platform.
Installation finished. No error reported.
Generating grub configuration file ...
Found deepin image:
basename: 缺少操作数
Try 'basename --help' for more information.

```