环境：ubuntu 20.04
esp-idf-v4.2(官网下载解压版本)
按照快速入门进行配置，到配置hellow world时，执行idf.py set-target esp32报错：

zhangch@zch-vm-esp:~/esp/hello_world$ idf.py set-target esp32
Adding "set-target"'s dependency "fullclean" to list of commands with default set of options.
Executing action: fullclean
Build directory ...