异常信息：

Cannot complete the install because one or more required items could not be found.
  Software being installed: m2e - slf4j over logback logging (Optional) 1.4.0.20130601-0317 
(org.eclipse.m2e.logback.feature.feature.group 1.4.0.20130601-0317)
  Missing requirement: Maven Integration for Eclipse 1.4.0.20130601-0317 (org.eclipse.m2e.core.ui 1.4.0.20130601-0317) 
requires ‘bundle org.slf4j.api 1.6.2‘ but it could not be found
  Cannot satisfy dependency:
    From: m2e logback appender 1.4.0.20130601-0317 (org.eclipse.m2e.logback.appender 1.4.0.20130601-0317)
    To: bundle org.eclipse.m2e.core.ui [1.4.0,1.5.0)
  Cannot satisfy dependency:
    From: m2e - slf4j over logback logging (Optional) 1.4.0.20130601-0317 (org.eclipse.m2e.logback.feature.feature.group 1.4.0.20130601-0317)
    To: org.eclipse.m2e.logback.appender [1.4.0.20130601-0317]

解决方法：

1. Help -> Install New Software...
   
2. Work with填写：http://www.fuin.org/p2-repository/ ，会有一段加载时间 -> 搜索框填写slf，然后按如下图勾选 -> Next...即可
   

   

3. 过程中可能提示重启，重启后再去安装m2e插件即可。

注意：提示缺少1.6.2，这里安装1.6.6是没问题的。