由于我升级到最新版本的 Ubuntu，我无法安装编译 Android 自定义 ROM 所需的 Java OpenJDK 包。当我运行时sudo apt-get install openjdk-7-jdk，出现以下错误：
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: openjdk-7-jdk …