The official website of virtualbox.org often fails.
You can directly visit this address to download the required version, including win, linux, VBoxGuestAdditions_7.0.10.iso, etc.[......]
相同得UUID无法重复导入得，修改命令：
BoxManage internalcommands sethduuid ./Rocky8.6_Server.vdi
[......]
转载自：
Ubuntu下使用VirtualBox安装Mac OS X Mavericks(10.9)上篇
Ubuntu下使用VirtualBox安装Mac OS X Mavericks(10.9)下篇
感谢原作者！！
再次提醒：在VM中安装Mac OS X属于非法行为，文章仅供观赏，请勿自行尝试。
本文介绍如何在Ubuntu下安装Mac OS X Mavericks系统。具体如下：
1）安装前准备工作
下载Mac OS X Mavericks系统，地址请自行百度。[......]