The following error occurs when you use eclipse Ganymede to install ADT.
Cannot complete the request. See the details.
Unsatisfied dependency: [COM. Android. Ide. Eclipse. ddms. feature. Group 12.0.0.v201281929-138431] 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.v201511281929-138431] 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.v201511281929-138431] 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.v201281929-138431] 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.v201281929-138431] requiredcapability: org. Eclipse. Equinox. p2.iu/org. Eclipse. UI/3.5.0
The solution is as follows:
1. Start eclipse, help-> software updates.
2. added the site http://dl.google.com/eclipse/plugin/3.4.
3. Return to the Software Update page and you will see a new item added to the available software page.
Select all its sub-items and click the Install button.
4. Follow the instructions for installation.
5. After the installation is complete, continue to install ADT.