问题：
The link /vmlinuz.old is a damaged link
Removing symbolic link vmlinuz.oldyou may need to re-run your boot loader[grub]
The link /initrd.img.old is a damaged link
Removing symbolic link initrd.img.old
you may need to re-run your boot loader[grub]
解决办法：
sudo /usr/sbin/update-grub