linux系统Defaulting to user installation because normal site-packages is not writeable

在Linux系统上，当使用pip3 install virtualenv创建虚拟环境时，可能会遇到"Defaulting to user installation because normal site-packages is not writeable"的错误提示。这是因为默认情况下，pip将软件包安装到系统的site-packages目录下，而这个目录可能没有写入权限。解决这个问题有两个方法。

第一个方法是使用命令python3 -m install virtualenv或者python3 -m pip install virtualenv来安装虚拟环境。这样可以避免使用pip直接安装到系统目录，而是通过Python的模块机制安装。

另一个方法是设置USER_BASE和USER_SITE路径，这样pip的下载路径就会被修改。你可以检查一下USER_BASE和USER_SITE是否已经设置为你想要的路径，这样就可以看到pip下载时的问题是否解决了。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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