我想在我的 debian 9 (stretch) 机器上安装 git，当我输入：
sudo apt install git-all
我收到这条消息：
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 followi`ng information may help to resolve the situation:
The following packages have unmet dependencies:
git-all : Depends: git …