当我使用sudo apt-get purge --auto-remove python3.4尝试卸载Python的时候，

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:
 language-selector-common : Depends: iso-codes but it is not going to be installed
 lsb-core : Depends: lsb-release (>= 9.20160110ubuntu0.2) but it is not going to be installed
            Depends: at
            Depends: bc
            Depends: cups-bsd or
                     lpr
            Depends: lprng or
                     cups-client
            Depends: m4
            Depends: pax
            Depends: alien (>= 8.36) but it is not going to be installed
            Depends: lsb-security (>= 9.20160110ubuntu0.2) but it is not going to be installed
 python3 : Depends: python3.5 (>= 3.5.1-2~) but it is not going to be installed
 python3-commandnotfound : Depends: lsb-release but it is not going to be installed
                           Depends: python3-gdbm but it is not going to be installed
 python3-dbus : Depends: libdbus-glib-1-2 (>= 0.78) but it is not going to be installed
 python3-distupgrade : Depends: lsb-release but it is not going to be installed
 python3-gi : Depends: libgirepository-1.0-1 (>= 1.44.0) but it is not going to be installed
              Depends: gir1.2-glib-2.0 (>= 1.39.0) but it is not going to be installed
 python3-update-manager : Depends: lsb-release but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

我是想卸载掉我装的Python3，但是突然冒出这么多错，关键在最后一行，他给我个解决办法，我尝试用这个方式去解决  apt-get -f install

但他又告诉我这个

E: Sub-process /usr/bin/dpkg returned an error code (1)

那我不能服输啊，又开始找解决方案

• 进入目录

  cd /var/lib/dpkg

• 删除文件  

  sudo mv info info.baksudo

• 3重新创建

  mkdir inf

这个时候我又尝试进行安装

apt-get -f install

但是没想到竟然好了，我又开始卸载

aptitude remove packagename

最终卸载成功