我有一个运行 Ubuntu 14 的虚拟机，我下载了版本：Luna Service Release 2 (4.4.2)。我正在 /opt/eclipse 文件夹中以 root 身份运行 eclipse。添加安装 URL http://epic.sf.net/updates 后，在安装组件期间会弹出以下错误。这是什么错误？我该如何解决？
An error occurred while collecting items to be installed
session context was:(profile=epp.package.java, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
No repository found containing: osgi.bundle,org.eclipse.egit,4.0.1.201506240215-r
No repository found containing: osgi.bundle,org.eclipse.egit.core,4.0.1.201506240215-r
No repository found containing: osgi.bundle,org.eclipse.egit.doc,4.0.1.201506240215-r
No repository found containing: osgi.bundle,org.eclipse.egit.mylyn.ui,4.0.1.201506240215-r
No repository found containing: osgi.bundle,org.eclipse.egit.ui,4.0.1.201506240215-r
No repository found containing: osgi.bundle,org.eclipse.jgit,4.0.1.201506240215-r
No repository found containing: osgi.bundle,org.eclipse.jgit.archive,4.0.1.201506240215-r
No repository found containing: org.eclipse.update.feature,org.eclipse.egit,4.0.1.201506240215-r
No repository found containing: org.eclipse.update.feature,org.eclipse.egit.mylyn,4.0.1.201506240215-r
No repository found containing: org.eclipse.update.feature,org.eclipse.jgit,4.0.1.201506240215-r
No repository found containing: osgi.bundle,org.slf4j.impl.log4j12,1.7.2.v20131105-2200