Cannot complete the install because one or more required items could not be found.
Software being installed: Android DDMS 20.0.0.v201206242043-391819 (com.android.ide.eclipse.ddms.feature.group 20.0.0.v201206242043-391819)
Missing requirement: Android DDMS 20.0.0.v201206242043-391819 (com.android.ide.eclipse.ddms.feature.group 20.0.0.v201206242043-391819) requires 'org.eclipse.ui 3.6.2' but it could not be found
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eclipse版本太低
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当时我也遇到这个问题了，无奈下载了一个最新的eclipse
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org.eclipse.ui 3.6.2
用Eclipse正确的版本，不一定高的就是正确的