Eclipse 3.7 Window Builder

[rsom91]

estou com um erro no momento em que tento instalar o window builder no eclipse…

Cannot complete the install because one or more required items could not be found.
Software being installed: GWT Designer 2.5.0.r37x201202061331 (com.google.gdt.eclipse.designer.feature.feature.group 2.5.0.r37x201202061331)
Missing requirement: WindowBuilder Core for XML GUI’s 1.3.0.r37x201202052344 (org.eclipse.wb.core.xml 1.3.0.r37x201202052344) requires ‘bundle org.eclipse.wst.sse.core 0.0.0’ but it could not be found
Cannot satisfy dependency:
From: GWT Designer 2.5.0.r37x201202061331 (com.google.gdt.eclipse.designer.feature.feature.group 2.5.0.r37x201202061331)
To: org.eclipse.wb.core.xml.feature.feature.group 1.3.0.r37x201202052344
Cannot satisfy dependency:
From: WindowBuilder XML Core (requires Eclipse WTP/WST) 1.3.0.r37x201202052344 (org.eclipse.wb.core.xml.feature.feature.group 1.3.0.r37x201202052344)
To: org.eclipse.wb.core.xml [1.3.0.r37x201202052344]

detalhe uso ubuntu 11.10 e instalei via repositorio…
gostaria de saber como acabar com esse erro e instalar ele…

[Ataxexe]

Ao que parece estão faltando duas dependências. Instale o plugin via update site que o Eclipse baixa as dependências automaticamente.