如何在Ubuntu 16.04中安装python2.7

Question

我正在Ubuntu16.04上安装Python2.7。当我键入python、python2或python2.7时，我会得到以下消息：

 The program 'python' can be found in the following packages:
 * python-minimal
 * python3
 Try: sudo apt install <selected package>

运行sudo apt install python2.7后，我得到以下消息，但输入python时，python仍然不可用。

Reading package lists... Done Building dependency tree Reading state
information... Done You might want to run 'apt-get -f install' to
correct these: The following packages have unmet dependencies: 
mongodb-compass : Depends: gvfs-bin
                  Depends: python but it is not going to be installed     
python2.7 : Depends: python2.7-minimal (= 2.7.12-1ubuntu0~16.04.3) but 
it is not going to be installed
            Depends: libpython2.7-stdlib (= 2.7.12-1ubuntu0~16.04.3) but   
it is not going to be installed
E: Unmet dependencies. 
Try 'apt-get -f install' with no packages (or specify a solution).

我也试过：

• sudo apt install python
• sudo apt install python2.7
• sudo apt install python2
• sudo apt-get install python
• sudo apt-get install python 2.7
• sudo apt-get install python2

到目前为止，什么都没有起作用。

我只需输入python3就可以访问Python3.5，但我需要python2.7。在尝试安装python之前，我更新了存储库。我做错了什么？

更新

运行python的缓存策略：

python2.7:
  Installed: (none)
  Candidate: 2.7.12-1ubuntu0~16.04.3
  Version table:
     2.7.12-1ubuntu0~16.04.3 500
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
     2.7.12-1ubuntu0~16.04.2 500
        500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
     2.7.11-7ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

运行mongodb的缓存策略：

mongodb-compass:
  Installed: 1.6.0-1
  Candidate: 1.6.0-1
  Version table:
 *** 1.6.0-1 100
        100 /var/lib/dpkg/status

Answer 1

尝试删除mongodb-compass

sudo apt-get purge mongodb-compass

然后检查所有的东西是否都在

sudo apt-get install -f
sudo apt-get check

Answer 2

尝试这个简单的命令并安装python2.7，谢谢

sudo apt安装python-最小

并检查您将获得2.7.X版本的版本(python -V)。