Ошибка установки Grails - неудовлетворенные зависимости

Я устанавливаю Grails на 12.10, используя инструкции на grails.org , но получаю ошибку на 3-м шаге, как описано ниже.

 sudo add-apt-repository ppa:groovy-dev/grails  
 sudo apt-get update
 sudo apt-get install grails-ppa

Ошибка, которую я получаю, показана ниже. У меня установлен Sun JDK, установлен JAVA_HOME, и JAVA_HOME / bin находится на пути.

Может кто-то предложить что-то, чтобы попытаться решить эту проблему?

sudo apt-get install grails-ppa
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 default-jre-headless:i386 : Depends: openjdk-7-jre-headless:i386 (>= 7~u3-2.1) but it is not going to be installed
 openjdk-7-jre:i386 : Depends: openjdk-7-jre-headless:i386 (= 7u7-2.3.2a-1ubuntu1) but it is not going to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.


java -version
java version "1.6.0_39"
Java(TM) SE Runtime Environment (build 1.6.0_39-b04)
Java HotSpot(TM) 64-Bit Server VM (build 20.14-b01, mixed mode)