Linux で Freemindがメニューから起動しない時

ERROR:   Your Java is not a complete implementation,
         =======================================
         FREEMIND WILL MOST PROBABLY *NOT* WORK,
         =======================================
         define JAVACMD, JAVA_BINDIR, JAVA_HOME or PATH in order
         to point to such a VM. See the manpage of freemind(1) for details.
Error: could not find libjava.so
Error: could not find Java 2 Runtime Environment.

    [exec] (freemind) {JAVA_HOME=/usr/lib/jvm/java-6-sun/ /usr/bin/freemind}