Ubuntu 安裝 JRE

$ sudo add-apt-repository ppa:webupd8team/java
$ sudo apt-get update
$ sudo apt-get install oracle-java7-installer

若是要移除 $sudo apt-get autoremove oracle-java7-installer
乾淨移除 $ sudo apt-get --purge remove oracle-java7-installer

檢查Java版本

vagrant@precise64:~$ java -version

java version "1.7.0_51"

Java(TM) SE Runtime Environment (build 1.7.0_51-b13)

Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)