Unable to locate package libasound2-dev

[SEUlegend]

我按照docs/prepare_env/install_guide.md中的步骤，执行到下面这个命令的时候，报错，请问是什么原因啊？
sudo apt-get install libasound2-dev portaudio19-dev

报错的完整消息：
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package libasound2-dev
E: Unable to locate package portaudio19-dev