yes it should be possible. the installer was created to work on Window$, Mac O$X and Linux distributions. Are you having any trouble? please report it back.
Like Mauricio has said, yes it is possible.
The 64 bit, shouldn't be a problem it is only dependent on your Java VM version.
I have JBPM5 running on my Ubuntu 64bit, using the Java 64 bit version, 1.6.0.