看了官方的说明文档，v4.2采用Python3,所以将Python改为了python3.6,从github上下载了zip包，解压到~/esp目录下，分别完成了install.sh和export.sh结果都成功，分别如下：

eric@eric-virtual-machine:~/esp/esp-idf$ sudo ./install.sh
[sudo] password for eric:
Detecting the Python interpreter
Checking "python" ...
Python 3.6.9
"python" has been detected ...

更新到最新版本后，使用idf.menuconfig命令报错，log如下：
Executing action: menuconfig
Running cmake in directory /home/eric/esp/hello_world/build
Executing "cmake -G Ninja -DPYTHON_DEPS_CHECKED=1 -DESP_PLATFORM=1 --warn-uninitialized -DCCACHE_ENABLE=0 /home/eric/esp/hello_world"...
Warn about uninitialized values ...