[android-developers] Error installing Android Studio Preview version

I am following the instructions for installing Android Studio Preview on Linux. I am running Ubuntu 12.10 64 bit. This is the specific message I got:

'tools.jar' is not in the Android Studio classpath.
Please ensure JAVA_HOME points to JDK rather than JRE.

I then tried:

export JAVA_HOME=/usr/lib/jvm/default-java

based on advice on askubuntu.com, to no avail. Does anyone know what the issue might be, or how I can go resolving this? I would really like to try out Android Studio, since it looks really cool based on the presentation during the IO keynote.

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