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LinuxNov posted a tutorial about upgrading Ubuntu/Kubuntu 11.04 to the latest KDE 4.7 desktop

Few days ago KDE 4.7 has been released with many new features, applications updates, along with many bugs fixes. check key features and new updated applications in KDE 4.7 Here.
  Upgrade To KDE 4.7 In Ubuntu/Kubuntu 11.04 Natty Narwhal