Debian APT 无法安装任何软件包

Question

我运行在 Dell XPS 15 (9560) 上使用 XFCE4 安装 Debian 9。最近我运行遇到了 apt 的麻烦。如果我尝试使用 apt-get install 运行任何东西，下面总是 return:

william@debian:~$ sudo apt-get install vim
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 vim : Depends: vim-common (= 2:7.4.488-7+deb8u3) but 2:8.0.0197-4+deb9u1 is to be installed
E: Unable to correct problems, you have held broken packages.

我试过运行宁sudo apt-get update、sudo apt-get upgrade、sudo apt --fix-broken install、sudo apt-get clean等等

其中一些 return 条消息是这样的：

william@debian:~$ sudo apt-get update
Ign:1 http://ftp.us.debian.org/debian jessie InRelease
Hit:2 http://ftp.us.debian.org/debian jessie Release
Reading package lists... Done

william@debian:~$ sudo apt-get install upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package upgrade

william@debian:~$ sudo apt-get install dist-upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package dist-upgrade

请帮忙，非常感谢:)