Cannot complete the install because one or more required items could not be found.
Software being installed: m2e - Maven Integration for Eclipse (includes Incubating components) 1.5.0.20140606-0033 (org.eclipse.m2e.feature.feature.group 1.5.0.20140606-0033)
Missing requirement: Maven Integration for Eclipse 1.5.0.20140606-0033 (org.eclipse.m2e.core 1.5.0.20140606-0033) requires 'bundle com.google.guava [14.0.1,16.0.0)' but it could not be found
Cannot satisfy dependency:
From: m2e - Maven Integration for Eclipse (includes Incubating components) 1.5.0.20140606-0033 (org.eclipse.m2e.feature.feature.group 1.5.0.20140606-0033)
To: org.eclipse.m2e.core [1.5.0.20140606-0033]
然后安装Eclipse WTP（Web工具平台）Juno 4.2。
解决办法
选择菜单Help Install New Software...，然后添加此存储库链接：
http://download.eclipse.org/technology/m2e/releases/1.2/1.2.0.20120903-1050/