[ubuntu] Trying to install freemind on unix

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http://ubuntuforums.org – I have encountered a bit of a problem trying to install FreeMind on Linux, and, I am not sure how to do it the right way, because it would seem that I cannot install rpm packages nor do I have the knowledge on replacing the current JDK version with sun java. jonathan@ubuntu:~$ java -version java version "1.6.0_27" OpenJDK Runtime Environment (IcedTea6 1.12.3) (6b27-1.12.3-0ubuntu1~12.04.1) OpenJDK Client VM (build 20.0-b12, mixed mode, sharing) jonathan@ubuntu:~$ rpm -ivh freemind*.rpm jcalendar*.rpm jgoodies-forms*.rpm Excerpt from http://freemind.sourceforge.net/wiki.. (Hardware)