我有个Virtualbox的Ubuntu Kylin虚拟机名为UbuntuKylin.vdi的虚拟磁盘。Parallels Desktop GUI图形界面导入该虚拟磁盘的时候，发生了错误，导致转换该虚拟磁盘失败。原因是无法识别安装于磁盘上的虚拟机操作系统。
当然这个可以通过命令行来解决。命令行下有个prl_convert工具，有一个–allow-no-os选项。
转到UbuntuKylin.vdi文件所在目录，执行以下命令就可以将虚拟磁盘转换为Parallels Desktop的.hdd格式虚拟磁盘了。
prl_convert UbuntuKylin.vdi --allow-no-os
更多有关prl_convert工具的命令可以参考此处
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