也许需要安装dirmngr

maybe you need install dirmngr

追加内容到/etc/apt/sources.list

Append content to /etc/apt/sources.list

deb [arch=amd64] https://packages.mkacg.com panda main

导入key

import key

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3BBF73EE77F2FB2A