title: Eclipse update (rarely) works: No repository found containing -- many entries
body: <p>I don't understand, why Eclipse update made so unreliable? Approximately each time I use it, I meet some problem!</p>
  
  <p>For example, now I meet bunch of delirium below. Disabling "Contact All Software Sites" does not help.</p>
  
  <pre><code>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.m2e.archetype.common,1.5.2.20150413-2214
  No repository found containing: osgi.bundle,org.eclipse.m2e.core,1.5.2.20150413-2215
  No repository found containing: osgi.bundle,org.eclipse.m2e.core.ui,1.5.2.20150413-2215
  No repository found containing: osgi.bundle,org.eclipse.m2e.discovery,1.5.2.20150413-2215
  No repository found containing: osgi.bundle,org.eclipse.m2e.editor,1.5.2.20150413-2215
  No repository found containing: osgi.bundle,org.eclipse.m2e.editor.xml,1.5.2.20150413-2215
  No repository found containing: osgi.bundle,org.eclipse.m2e.jdt,1.5.2.20150413-2215
  No repository found containing: osgi.bundle,org.eclipse.m2e.jdt.ui,1.5.2.20150413-2215
  No repository found containing: osgi.bundle,org.eclipse.m2e.launching,1.5.2.20150413-2215
  No repository found containing: osgi.bundle,org.eclipse.m2e.lifecyclemapping.defaults,1.5.2.20150413-2215
  No repository found containing: osgi.bundle,org.eclipse.m2e.logback.appender,1.5.2.20150413-2215
  No repository found containing: osgi.bundle,org.eclipse.m2e.logback.configuration,1.5.2.20150413-2215
  No repository found containing: osgi.bundle,org.eclipse.m2e.maven.indexer,1.5.2.20150413-2214
  No repository found containing: osgi.bundle,org.eclipse.m2e.maven.runtime,1.5.2.20150413-2214
  No repository found containing: osgi.bundle,org.eclipse.m2e.maven.runtime.slf4j.simple,1.5.2.20150413-2214
  No repository found containing: osgi.bundle,org.eclipse.m2e.model.edit,1.5.2.20150413-2215
  No repository found containing: osgi.bundle,org.eclipse.m2e.profiles.core,1.5.2.20150413-2215
  No repository found containing: osgi.bundle,org.eclipse.m2e.profiles.ui,1.5.2.20150413-2215
  No repository found containing: osgi.bundle,org.eclipse.m2e.refactoring,1.5.2.20150413-2215
  No repository found containing: osgi.bundle,org.eclipse.m2e.scm,1.5.2.20150413-2215
  No repository found containing: osgi.bundle,org.eclipse.mylyn.bugzilla.core,3.15.0.v20150204-0622
  No repository found containing: osgi.bundle,org.eclipse.mylyn.bugzilla.ide,3.15.0.v20150113-0039
  No repository found containing: osgi.bundle,org.eclipse.mylyn.bugzilla.ui,3.15.0.v20150203-1905
  No repository found containing: osgi.bundle,org.eclipse.mylyn.builds.core,1.7.0.v20150113-2201
  No repository found containing: osgi.bundle,org.eclipse.mylyn.builds.ui,1.7.0.v20150113-2201
  No repository found containing: osgi.bundle,org.eclipse.mylyn.commons.core,3.15.0.v20150112-2323
  No repository found containing: osgi.bundle,org.eclipse.mylyn.commons.identity.core,1.7.0.v20150112-2323
  No repository found containing: osgi.bundle,org.eclipse.mylyn.commons.net,3.15.0.v20150112-2323
  No repository found containing: osgi.bundle,org.eclipse.mylyn.commons.notifications.core,1.7.0.v20150112-2323
  No repository found containing: osgi.bundle,org.eclipse.mylyn.commons.notifications.feed,1.7.0.v20150112-2323
  No repository found containing: osgi.bundle,org.eclipse.mylyn.commons.notifications.ui,1.7.0.v20150112-2323
  No repository found containing: osgi.bundle,org.eclipse.mylyn.commons.repositories.core,1.7.0.v20150112-2323
  No repository found containing: osgi.bundle,org.eclipse.mylyn.commons.repositories.http.core,1.7.0.v20150112-2323
  No repository found containing: osgi.bundle,org.eclipse.mylyn.commons.repositories.ui,1.7.0.v20150112-2323
  No repository found containing: osgi.bundle,org.eclipse.mylyn.commons.screenshots,3.15.0.v20150112-2323
  No repository found containing: osgi.bundle,org.eclipse.mylyn.commons.ui,3.15.0.v20150112-2323
  No repository found containing: osgi.bundle,org.eclipse.mylyn.commons.workbench,3.15.0.v20150112-2323
  No repository found containing: osgi.bundle,org.eclipse.mylyn.commons.xmlrpc,3.15.0.v20150112-2323
  No repository found containing: osgi.bundle,org.eclipse.mylyn.context.core,3.15.0.v20150113-0039
  No repository found containing: osgi.bundle,org.eclipse.mylyn.context.tasks.ui,3.15.0.v20150113-0039
  No repository found containing: osgi.bundle,org.eclipse.mylyn.context.ui,3.15.0.v20150113-0039
  No repository found containing: osgi.bundle,org.eclipse.mylyn.cvs.core,1.7.0.v20150113-0039
  No repository found containing: osgi.bundle,org.eclipse.mylyn.debug.ui,3.15.0.v20150113-0039
  No repository found containing: osgi.bundle,org.eclipse.mylyn.discovery.core,3.15.0.v20150112-2323
  No repository found containing: osgi.bundle,org.eclipse.mylyn.discovery.ui,3.15.0.v20150112-2323
  No repository found containing: osgi.bundle,org.eclipse.mylyn.git.core,1.7.0.v20150113-0039
  No repository found containing: osgi.bundle,org.eclipse.mylyn.git.ui,1.7.0.v20150113-0039
  No repository found containing: osgi.bundle,org.eclipse.mylyn.help.ui,3.15.0.v20150113-0037
  No repository found containing: osgi.bundle,org.eclipse.mylyn.hudson.core,1.7.0.v20150113-2201
  No repository found containing: osgi.bundle,org.eclipse.mylyn.hudson.ui,1.7.0.v20150113-2201
  No repository found containing: osgi.bundle,org.eclipse.mylyn.ide.ant,3.15.0.v20150113-0039
  No repository found containing: osgi.bundle,org.eclipse.mylyn.ide.ui,3.15.0.v20150113-0039
  No repository found containing: osgi.bundle,org.eclipse.mylyn.java.tasks,3.15.0.v20150113-0039
  No repository found containing: osgi.bundle,org.eclipse.mylyn.java.ui,3.15.0.v20150113-0039
  No repository found containing: osgi.bundle,org.eclipse.mylyn.monitor.core,3.15.0.v20150112-2323
  No repository found containing: osgi.bundle,org.eclipse.mylyn.monitor.ui,3.15.0.v20150112-2323
  No repository found containing: osgi.bundle,org.eclipse.mylyn.resources.ui,3.15.0.v20150113-0039
  No repository found containing: osgi.bundle,org.eclipse.mylyn.tasks.bugs,3.15.0.v20150113-0037
  No repository found containing: osgi.bundle,org.eclipse.mylyn.tasks.core,3.15.0.v20150311-2102
  No repository found containing: osgi.bundle,org.eclipse.mylyn.tasks.index.core,3.15.0.v20150113-0037
  No repository found containing: osgi.bundle,org.eclipse.mylyn.tasks.index.ui,3.15.0.v20150113-0037
  No repository found containing: osgi.bundle,org.eclipse.mylyn.tasks.search,3.15.0.v20150113-0037
  No repository found containing: osgi.bundle,org.eclipse.mylyn.tasks.ui,3.15.0.v20150316-1810
  No repository found containing: osgi.bundle,org.eclipse.mylyn.team.cvs,3.15.0.v20150113-0039
  No repository found containing: osgi.bundle,org.eclipse.mylyn.team.ui,3.15.0.v20150113-0039
  No repository found containing: osgi.bundle,org.eclipse.mylyn.versions.core,1.7.0.v20150113-0039
  No repository found containing: osgi.bundle,org.eclipse.mylyn.versions.ui,1.7.0.v20150113-0039
  No repository found containing: osgi.bundle,org.eclipse.mylyn.wikitext.confluence.core,2.4.0.v20150312-2106
  No repository found containing: osgi.bundle,org.eclipse.mylyn.wikitext.confluence.ui,2.4.0.v20150309-1623
  No repository found containing: osgi.bundle,org.eclipse.mylyn.wikitext.context.ui,2.4.0.v20150309-1623
  No repository found containing: osgi.bundle,org.eclipse.mylyn.wikitext.core,2.4.0.v20150316-1438
  No repository found containing: osgi.bundle,org.eclipse.mylyn.wikitext.core.ant,2.4.0.v20150309-1623
  No repository found containing: osgi.bundle,org.eclipse.mylyn.wikitext.core.osgi,2.4.0.v20150309-1638
  No repository found containing: osgi.bundle,org.eclipse.mylyn.wikitext.help.ui,2.4.0.v20150309-1623
  No repository found containing: osgi.bundle,org.eclipse.mylyn.wikitext.html.core,2.4.0.v20150309-2304
  No repository found containing: osgi.bundle,org.eclipse.mylyn.wikitext.markdown.core,2.4.0.v20150316-1818
  No repository found containing: osgi.bundle,org.eclipse.mylyn.wikitext.markdown.ui,2.4.0.v20150309-1623
  No repository found containing: osgi.bundle,org.eclipse.mylyn.wikitext.mediawiki.core,2.4.0.v20150309-1638
  No repository found containing: osgi.bundle,org.eclipse.mylyn.wikitext.mediawiki.ui,2.4.0.v20150309-1623
  No repository found containing: osgi.bundle,org.eclipse.mylyn.wikitext.tasks.ui,2.4.0.v20150309-1638
  No repository found containing: osgi.bundle,org.eclipse.mylyn.wikitext.textile.core,2.4.0.v20150312-2106
  No repository found containing: osgi.bundle,org.eclipse.mylyn.wikitext.textile.ui,2.4.0.v20150309-1623
  No repository found containing: osgi.bundle,org.eclipse.mylyn.wikitext.tracwiki.core,2.4.0.v20150309-1623
  No repository found containing: osgi.bundle,org.eclipse.mylyn.wikitext.tracwiki.ui,2.4.0.v20150309-1623
  No repository found containing: osgi.bundle,org.eclipse.mylyn.wikitext.twiki.core,2.4.0.v20150309-1638
  No repository found containing: osgi.bundle,org.eclipse.mylyn.wikitext.twiki.ui,2.4.0.v20150309-1623
  No repository found containing: osgi.bundle,org.eclipse.mylyn.wikitext.ui,2.4.0.v20150309-1638
  No repository found containing: osgi.bundle,org.eclipse.tcf.te.ui.terminals,1.3.0.201502251423
  No repository found containing: osgi.bundle,org.eclipse.tcf.te.ui.terminals.local,1.3.0.201502201446
  No repository found containing: osgi.bundle,org.eclipse.tcf.te.ui.terminals.process,1.3.0.201502201446
  No repository found containing: osgi.bundle,org.eclipse.tcf.te.ui.terminals.serial,1.3.0.201502201446
  No repository found containing: osgi.bundle,org.eclipse.tcf.te.ui.terminals.ssh,1.3.0.201502201446
  No repository found containing: osgi.bundle,org.eclipse.tcf.te.ui.terminals.telnet,1.3.0.201502201446
  No repository found containing: osgi.bundle,org.eclipse.tm.terminal,3.3.1.201502251211
  No repository found containing: osgi.bundle,org.eclipse.tm.terminal.serial,2.1.400.201502240653
  No repository found containing: osgi.bundle,org.eclipse.tm.terminal.ssh,2.1.400.201502240653
  No repository found containing: osgi.bundle,org.eclipse.tm.terminal.telnet,2.1.400.201502240653
  No repository found containing: org.eclipse.update.feature,org.eclipse.m2e.feature,1.5.2.20150413-2215
  No repository found containing: org.eclipse.update.feature,org.eclipse.m2e.logback.feature,1.5.2.20150413-2215
  No repository found containing: org.eclipse.update.feature,org.eclipse.mylyn.bugzilla_feature,3.15.0.v20150204-0622
  No repository found containing: org.eclipse.update.feature,org.eclipse.mylyn.builds,1.7.0.v20150113-2201
  No repository found containing: org.eclipse.update.feature,org.eclipse.mylyn.commons,3.15.0.v20150112-2323
  No repository found containing: org.eclipse.update.feature,org.eclipse.mylyn.commons.identity,1.7.0.v20150112-2323
  No repository found containing: org.eclipse.update.feature,org.eclipse.mylyn.commons.notifications,1.7.0.v20150112-2323
  No repository found containing: org.eclipse.update.feature,org.eclipse.mylyn.commons.repositories,1.7.0.v20150112-2323
  No repository found containing: org.eclipse.update.feature,org.eclipse.mylyn.commons.repositories.http,1.7.0.v20150112-2323
  No repository found containing: org.eclipse.update.feature,org.eclipse.mylyn.context_feature,3.15.0.v20150113-0039
  No repository found containing: org.eclipse.update.feature,org.eclipse.mylyn.cvs,1.7.0.v20150113-0039
  No repository found containing: org.eclipse.update.feature,org.eclipse.mylyn.discovery,3.15.0.v20150112-2323
  No repository found containing: org.eclipse.update.feature,org.eclipse.mylyn.git,1.7.0.v20150113-0039
  No repository found containing: org.eclipse.update.feature,org.eclipse.mylyn.hudson,1.7.0.v20150113-2201
  No repository found containing: org.eclipse.update.feature,org.eclipse.mylyn.ide_feature,3.15.0.v20150113-0039
  No repository found containing: org.eclipse.update.feature,org.eclipse.mylyn.java_feature,3.15.0.v20150113-0039
  No repository found containing: org.eclipse.update.feature,org.eclipse.mylyn.monitor,3.15.0.v20150112-2323
  No repository found containing: org.eclipse.update.feature,org.eclipse.mylyn.tasks.ide,3.15.0.v20150113-0037
  No repository found containing: org.eclipse.update.feature,org.eclipse.mylyn.team_feature,3.15.0.v20150113-0039
  No repository found containing: org.eclipse.update.feature,org.eclipse.mylyn.versions,1.7.0.v20150113-0039
  No repository found containing: org.eclipse.update.feature,org.eclipse.mylyn.wikitext_feature,2.4.0.v20150316-1818
  No repository found containing: org.eclipse.update.feature,org.eclipse.mylyn_feature,3.15.0.v20150316-1810
  No repository found containing: osgi.bundle,org.eclipse.tcf.te.core.terminals,1.3.0.201502201518
  No repository found containing: org.eclipse.update.feature,org.eclipse.tcf.te.terminals.feature,1.3.0.201502251423
  No repository found containing: org.eclipse.update.feature,org.eclipse.tm.terminal,3.7.1.201502251223
  No repository found containing: org.eclipse.update.feature,org.eclipse.tm.terminal.serial,3.7.0.201502251223
  No repository found containing: org.eclipse.update.feature,org.eclipse.tm.terminal.ssh,3.7.0.201502251223
  No repository found containing: org.eclipse.update.feature,org.eclipse.tm.terminal.telnet,3.7.0.201502251223
  </code></pre>