eclipse ganymede版无法安装adt解决

在使用eclipse ganymede安装adt时，出现下列错误

Cannot complete the request.  See the details.
Unsatisfied dependency: [com.android.ide.eclipse.ddms.feature.group 12.0.0.v201106281929-138431] requiredCapability: org.eclipse.equinox.p2.iu/org.eclipse.core.runtime/3.5.0
Unsatisfied dependency: [com.android.ide.eclipse.traceview.feature.group 12.0.0.v201106281929-138431] requiredCapability: org.eclipse.equinox.p2.iu/org.eclipse.core.runtime/3.5.0
Unsatisfied dependency: [com.android.ide.eclipse.hierarchyviewer.feature.group 12.0.0.v201106281929-138431] requiredCapability: org.eclipse.equinox.p2.iu/org.eclipse.core.runtime/3.5.0
Unsatisfied dependency: [com.android.ide.eclipse.adt.feature.group 12.0.0.v201106281929-138431] requiredCapability: org.eclipse.equinox.p2.iu/org.eclipse.core.runtime/3.5.0
Unsatisfied dependency: [com.android.ide.eclipse.ddms.feature.group 12.0.0.v201106281929-138431] requiredCapability: org.eclipse.equinox.p2.iu/org.eclipse.ui/3.5.0

解决步骤如下：

1.启动eclipse，help->Software updates。

2.新增站点 http://dl.google.com/eclipse/plugin/3.4。

3.回到software update界面，会看到在available software页新增了一项。

选中其所有子项，点击install按钮。

4.按照指引进行安装。

5.完成安装后，后续再继续安装ADT，即可。