我正在使用 ubutu 14.04。当我从 letsencrypt.com 运行 certbot-auto 时出现以下错误（虽然我认为这不相关），并收到以下错误消息：
python-dev : Depends: python (= 2.7.5-5ubuntu3) but 2.7.12-1 is to be installed
python-virtualenv : Depends: python-pkg-resources but it is not going to be installed
Depends: python-setuptools but it is not going to be installed
Depends: python:any (>= 2.7.1-0ubuntu2)
E: Unable to correct problems, you have held broken packages.
当我尝试手动安装这些软件包时，出现错误，例如dpkg: warning: unable to delete old directory '/path/to/Python-2.7.12': Directory not empty
我当前的 python 版本是 2.7.6...我完全卸载 2.7.6 并安装 2.7.5 是个好主意吗？