petalinux-config出错 以为是pyenv的问题，后发现不是，把pyenv的安装卸载总结如下：

折腾了半天发觉是安装了pyenv导致的python版本混乱，卸载后问题解决了。（卸载过程见https://github.com/pyenv/pyenv/blob/master/README.md#uninstalling-python-versions）

还需要将~/.bashrc中的相应代码行注释掉

$ echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.bash_profile

$ echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.bash_profile
还有pyenv init行

能正常config build。

Installation

 $ git clone https://github.com/pyenv/pyenv.git ~/.pyenv

不同系统不同，注意
Zsh note: Modify your ~/.zshenv file instead of ~/.bash_profile. 
Ubuntu and Fedora note: Modify your ~/.bashrc file instead of ~/.bash_profile. 
Proxy note: If you use a proxy, export http_proxy and HTTPS_PROXY too.

$ echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.bashrc

$ echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.bashrc

$ echo -e 'if command -v pyenv 1>/dev/null 2>&1; then\n  eval "$(pyenv init -)"\nfi' >> ~/.bashrc

$ exec "$SHELL"

Uninstalling pyenv

simply remove the pyenv init line from your shell startup configuration

To completely uninstall pyenv, perform step (1) and then remove its root directory. This will delete all Python versions that were installed under $(pyenv root)/versions/ directory:

rm -rf $(pyenv root)