If you’re trying to install the Android Developer Tools on Ubuntu and it keeps failing on a strange error:

An error occurred while installing the items
session context was:(profile=PlatformProfile, phase=org.eclipse.equinox.internal.provisional.p2.engine.phases.Install, operand=null –> [R]org.eclipse.ant.ui 3.4.1.v20090901_r351, action=org.eclipse.equinox.internal.p2.touchpoint.eclipse.actions.InstallBundleAction).
The artifact file for osgi.bundle,org.eclipse.ant.ui,3.4.1.v20090901_r351 was not found.

Here’s your solution:

sudo apt-get install eclipse-pde

Worked for me, found it here.