Gwt installation on Linux Ubuntu

I am getting below mentioned errors while installing GWT plugin on my Linux box.

uname -a
Linux mayank-Inspiron-1525 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:24 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

Eclipse IDE for Java Developers

Version: 1.3.2.20110218-0812
Build id: 20110218-0911

(c) Copyright Eclipse contributors and others 2000, 2011.  All rights reserved.
Visit http://www.eclipse.org/platform

This product includes software developed by the
Apache Software Foundation http://www.apache.org/

Cannot complete the install because one or more required items could not be found.

Software being installed: Google Web Toolkit SDK 2.3.0 2.3.0.r36v201104261928 (com.google.gwt.eclipse.sdkbundle.e36.feature.feature.group 2.3.0.r36v201104261928)

Missing requirement: Google Web Toolkit Plugin 2.3.1.r36v201105092302 (com.google.gwt.eclipse.core 2.3.1.r36v201105092302) requires 'bundle org.eclipse.pde.core 0.0.0' but it could not be found

Cannot satisfy dependency:

From: Google Web Toolkit SDK 2.3.0.r36v201104261928 (com.google.gwt.eclipse.sdkbundle 2.3.0.r36v201104261928)

To: bundle com.google.gwt.eclipse.core 0.0.0

Cannot satisfy dependency:

From: Google Web Toolkit SDK 2.3.0 2.3.0.r36v201104261928 (com.google.gwt.eclipse.sdkbundle.e36.feature.feature.group 2.3.0.r36v201104261928)

To: com.google.gwt.eclipse.sdkbundle [2.3.0.r36v201104261928]

Any one encountered same error or having an idea how to fix this?

Regards,
Mayank Jain