Ubuntu下gradle運行卡住，出現Exception in thread "png-cruncher_xxx"錯誤的解決辦法

ubuntu下用GRADLE 編譯android應用，一直卡住，看了一下錯誤日誌：

Thread(png-cruncher_14) has a null payload
java.io.IOException: Cannot run program "/opt/sdk1/build-tools/23.0.1/aapt": error=2, No such file or directory
	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
	at com.android.builder.png.AaptProcess$Builder.start(AaptProcess.java:163)
	at com.android.builder.png.QueuedCruncher$1.creation(QueuedCruncher.java:106)
	at com.android.builder.tasks.WorkQueue.run(WorkQueue.java:203)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.IOException: error=2, No such file or directory
	at java.lang.UNIXProcess.forkAndExec(Native Method)
	at java.lang.UNIXProcess.<init>(UNIXProcess.java:248)
	at java.lang.ProcessImpl.start(ProcessImpl.java:134)
	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
	... 4 more

原因是，我是64位的系統，系統缺少32位的相關依賴庫。

打開終端依次運行以下命令，重新編譯就可以了

sudo dpkg --add-architecture i386
sudo apt-get update
sudo apt-get install libncurses5:i386 libstdc++6:i386 zlib1g:i386