JDK de 32 bits en Ubuntu 64 bits

En Ubuntu 12.04 x64, usando una jdk de 32 bits, al querer usar javaws da el siguiente error:

Exception in thread "main" java.lang.UnsatisfiedLinkError: /opt/jdk6x32/jdk1.6.0_35/jre/lib/i386/xawt/libmawt.so: libXtst.so.6: cannot open shared object file: No such file or directory at java.lang.ClassLoader$NativeLibrary.load(Native Method) at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1807) at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1703) at java.lang.Runtime.load0(Runtime.java:770) at java.lang.System.load(System.java:1003) at java.lang.ClassLoader$NativeLibrary.load(Native Method) at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1807) at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1724) at java.lang.Runtime.loadLibrary0(Runtime.java:823) at java.lang.System.loadLibrary(System.java:1028) at sun.security.action.LoadLibraryAction.run(LoadLibraryAction.java:50) at java.security.AccessController.doPrivileged(Native Method) at java.awt.Toolkit.loadLibraries(Toolkit.java:1605) at java.awt.Toolkit.(Toolkit.java:1627) at com.sun.javaws.Main.main(Main.java:99)

Para solucionarlo, tuve que instalar la librería pero de 32 bits:

sudo apt-get install libxtst6:i386