我想在debian（挤压）服务器中安装python-apt包：
root@server:# apt-get install python-apt
但是我收到以下错误：
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:
python-apt : Depends: libapt-inst1.2
Depends: libapt-pkg4.10
E: Unable to correct problems, you have held broken packages.
我不知道如何纠正这个错误：（