转载：http://blog.csdn.net/coloriy/article/details/60878527
系统是Ubuntu14.04，安装步骤如下：
1、添加PPA仓库，执行命令：
- sudo add-apt-repository ppa:cwchien/gradle
2、更新源，执行命令：
- sudo apt-get update
3、查看可以安装的Gradle版本，执行命令：
- apt-cache search gradle
我的系统查看结果如下：
- gradle-doc - Documentation for gradle
- libgradle-core-java - Groovy based build system - Core library
- libgradle-plugins-java - Groovy based build system - All plugins
- missidentify - a program to find win32 applications
- gradle - Gradle is a Groovy based build system
- gradle-ppa - Gradle is a Groovy based build system
- gradle-2.10 - Gradle is a Groovy based build system
- gradle-2.11 - Gradle is a Groovy based build system
- gradle-2.12 - Gradle is a Groovy based build system
- gradle-2.13 - Gradle is a Groovy based build system
- gradle-2.14 - Gradle is a Groovy based build system
- gradle-2.14.1 - Gradle is a Groovy based build system
- gradle-3.0 - Gradle is a Groovy based build system
- gradle-3.1 - Gradle is a Groovy based build system
4、安装目标版本，我选择安装gradle-3.1，执行命令：
- sudo apt-get install gradle-3.1
5、需要注意的是，运行gradle3.1需要JDK7及其之上的版本，否则运行会给出如下提示：
- FAILURE: Build failed with an exception.
- * What went wrong:
- Gradle 3.1 requires Java 7 or later to run. You are currently using Java 6.
