有时，当我安装东西时，我会收到如下错误：
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:
package1 : Depends: package2 (>= 1.8) but 1.7.5-1ubuntu1 is to be installed
E: Unable to correct problems, you have held broken packages.
我该如何解决这个问题？
package-management apt ppa dependencies software-installation
我尝试安装 Synaptic Package Manager，但收到以下错误消息：
Package dependencies cannot be resolved.
This error could be caused by required additional software packages which are missing or not installable.
Furthermore there could be a conflict between software packages which are not allowed to be installed at the same time.
在我将装有 Ubuntu 14.04.1 的硬盘驱动器放入新电脑后，系统设置不会显示。我试过了：
sudo apt-get install unity-control-center
但我明白了
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:
unity-control-center : Depends: libcheese-gtk23 (>= 3.4.0) …我发出了在https://wiki.ubuntu.com/Kernel/LTSEnablementStack 上找到的命令字符串并得到了这个结果：
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:
account-plugin-facebook : Depends: libaccount-plugin-generic-oauth but it is not going to be …