/boot目录下文件丢失,通过光驱进入救援模式切根后无法挂载光盘,报错

使用虚拟机模拟boot目录文件全部丢失,在救援模式下重装内核、grub2和重新生成配置文件。但是从光驱进入救援模式后,chroot /mnt/sysroot,然后挂载光驱报错,提示已经挂载或挂载点忙。新建挂载目录也同样挂载不成功。

请问挂载不成功的原因,另外重装内核还可以通过哪种方法?

因无法发图片,手打部分命令,OS:openEuler-24.03-LTS

If you would like to make the root of your system the root of the active system,run the command:
chroot /mt/sysroot
When finished, please exit from the shell and your system will reboot.
Please press ENTER to get a shell:
bash-5.2# chroot /mmt/sysroot/

bash-5.2# mount /dev/sr0 /mnt
mount: /mt: /dev/sr0 already mounted or mount point busy.
dmesg(1) may have more information after failed mount system call.

再添加一个光驱就解决问题了,报错原因应该是该光驱已挂载,硬盘是通过光驱的微型系统进入的,无法再挂载