系統：Ubuntu 14.04
編譯 Android 7.1 系統需要 JDK 8，但是安裝時失敗，
$ sudo apt install openjdk-8-jdk Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package openjdk-8-jdk
解決辦法：
$ sudo add-apt-repository ppa:openjdk-r/ppa $ sudo apt-get update $ sudo apt-get install openjdk-8-jdk