我正在运行 Debian 8.7，我想安装不稳定包 dolphin-emu这样我就可以在电脑上玩 GameCube 游戏了。
我跟着Serverfault 上的这个答案更改我的 apt 配置以便安装不稳定的软件包。但是，它不起作用。
$ sudo apt-get install dolphin-emu
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:
dolphin-emu : Depends: libavcodec57 (>= 7:3.0) but it is not going to be installed or
libavcodec-extra57 (>= 7:3.0) but it is not going to be installed
Depends: libavformat57 (>= 7:3.0) but it is not going to be installed
Depends: libsfml-network2.4 but it is not going to be installed
Depends: libsfml-system2.4 but it is not going to be installed
Depends: libsoundtouch1 (>= 1.9.2) but it is not going to be installed
Depends: libstdc++6 (>= 6) but 4.9.2-10 is to be installed
Depends: libwxbase3.0-0v5 (>= 3.0.2+dfsg) but it is not going to be installed
Depends: libwxgtk3.0-0v5 (>= 3.0.2+dfsg) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
看起来 apt-get 拒绝安装一些依赖项。
我怎样才能让它工作？