在 Ubuntu 20.04 中，我们收到以下错误：
? lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04 LTS
Release: 20.04
Codename: focal
? youtube-dl https://www.youtube.com/watch?v=b4mihzeFqGA
/usr/bin/env: ‘python’: No such file or directory
我该如何解决？