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Cannot complete the install because one or more required items could not be found.
  Software being installed: m2e connector for build-helper-maven-plugin     0.15.0.201109290002 (org.sonatype.m2e.buildhelper.feature.feature.group 0.15.0.201109290002)
  Missing requirement: m2e connector for build-helper-maven-plugin 0.15.0.201109290002 (org.sonatype.m2e.buildhelper 0.15.0.201109290002) requires 'bundle org.eclipse.m2e.jdt [1.1.0,1.2.0)' but it could not be found
  Cannot satisfy dependency:
    From: m2e connector for build-helper-maven-plugin 0.15.0.201109290002 (org.sonatype.m2e.buildhelper.feature.feature.group 0.15.0.201109290002)
    To: org.sonatype.m2e.buildhelper [0.15.0.201109290002]

Solution – add the following update site:

http://download.eclipse.org/technology/m2e/releases/1.1

Outcome:

An error occurred while collecting items to be installed
session context was:(profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
Multiple problems occurred while downloading.
Unable to read repository at http://download.eclipse.org/technology/m2e/milestones/1.1/1.1.0.20111108-0328/plugins/org.eclipse.m2e.refactoring_1.1.0.20111108-0328.jar.pack.gz.
Read timed out
Unable to read repository at http://download.eclipse.org/technology/m2e/milestones/1.1/1.1.0.20111108-0328/plugins/org.eclipse.m2e.refactoring_1.1.0.20111108-0328.jar.
Read timed out

Cannot complete the install because of a conflicting dependency.
  Software being installed: m2e connector for build-helper-maven-plugin 0.15.0.201109290002 (org.sonatype.m2e.buildhelper.feature.feature.group 0.15.0.201109290002)
  Software currently installed: m2e - Maven Integration for Eclipse 1.0.100.20110804-1717 (org.eclipse.m2e.feature.feature.group 1.0.100.20110804-1717)
  Only one of the following can be installed at once:
    Maven Integration for Eclipse 1.0.0.20110607-2117 (org.eclipse.m2e.core 1.0.0.20110607-2117)
    Maven Integration for Eclipse 1.1.0.20111108-0328 (org.eclipse.m2e.core 1.1.0.20111108-0328)
    Maven Integration for Eclipse 1.0.100.20110804-1717 (org.eclipse.m2e.core 1.0.100.20110804-1717)
  Cannot satisfy dependency:
    From: m2e - Maven Integration for Eclipse 1.0.100.20110804-1717 (org.eclipse.m2e.feature.feature.group 1.0.100.20110804-1717)
    To: org.eclipse.m2e.core [1.0.100.20110804-1717]
  Cannot satisfy dependency:
    From: m2e connector for build-helper-maven-plugin 0.15.0.201109290002 (org.sonatype.m2e.buildhelper 0.15.0.201109290002)
    To: bundle org.eclipse.m2e.core [1.1.0,1.2.0)
  Cannot satisfy dependency:
    From: m2e connector for build-helper-maven-plugin 0.15.0.201109290002 (org.sonatype.m2e.buildhelper.feature.feature.group 0.15.0.201109290002)
    To: org.sonatype.m2e.buildhelper [0.15.0.201109290002]