--- rt.equinox.p2/bundles/org.eclipse.equinox.p2.engine/src/org/eclipse/equinox/internal/p2/engine/SimpleProfileRegistry.java.orig	2014-03-24 10:49:00.000000000 +0000
+++ rt.equinox.p2/bundles/org.eclipse.equinox.p2.engine/src/org/eclipse/equinox/internal/p2/engine/SimpleProfileRegistry.java	2014-03-24 15:39:32.122246214 +0000
@@ -44,6 +44,7 @@
 
 public class SimpleProfileRegistry implements IProfileRegistry, IAgentService {
 
+	private static final String PROP_IGNORE_USER_CONFIGURATION = "eclipse.ignoreUserConfiguration"; //$NON-NLS-1$
 	private static final String SIMPLE_PROFILE_REGISTRY_INTERNAL = "_simpleProfileRegistry_internal_"; //$NON-NLS-1$
 	private static final String PROFILE_REGISTRY = "profile registry"; //$NON-NLS-1$
 	private static final String PROFILE_PROPERTIES_FILE = "state.properties"; //$NON-NLS-1$
@@ -279,6 +280,14 @@
 					//fragments support - remeber the property
 					internalSetProfileStateProperty(profile, profile.getTimestamp(), SIMPLE_PROFILE_REGISTRY_INTERNAL + getExtTimeStamp(), getExtTimeStamp());
 					agent.registerService(SERVICE_SHARED_INSTALL_NEW_TIMESTAMP, Long.toString(profile.getTimestamp()));
+
+					// this looks like a hack, but:
+					// (1) SimpleConfigurationImpl keeps returning master configuration as long as the property is set
+					// (2) SimpleConfigurationImpl sets the propery after it drops user configuration
+					// therefore dropins reconciliation can't load dropins plugins installed into user configuration
+					// after the user configuration has been dropped.
+					// It is necessary to unset this property.
+					//System.setProperty(PROP_IGNORE_USER_CONFIGURATION, "processed_and_unset"); //$NON-NLS-1$ //$NON-NLS-2$
 				} else {
 					//This is the first time we create the shared profile. Tag it as such and also remember the timestamp of the base
 					internalSetProfileStateProperty(profile, profile.getTimestamp(), IProfile.STATE_PROP_SHARED_INSTALL, IProfile.STATE_SHARED_INSTALL_VALUE_INITIAL);
@@ -312,6 +321,13 @@
 		if (agent.getService(SERVICE_SHARED_INSTALL_NEW_TIMESTAMP) != null)
 			return false;
 
+		// if the property is set by OSGI, and there is no new timestamp (because of the previous condition)
+		// ignore current profile. This will happen only once, because SERVICE_SHARED_INSTALL_NEW_TIMESTAMP
+		// is set during profile reset.
+		if ("true".equals(System.getProperty(PROP_IGNORE_USER_CONFIGURATION))) { //$NON-NLS-1$ //$NON-NLS-2$
+			System.setProperty(PROP_IGNORE_USER_CONFIGURATION, "processed_and_unset"); //$NON-NLS-1$ //$NON-NLS-2$
+			return true;
+		}
 		String baseTimestamp = getBaseTimestamp(profile.getProfileId());
 		String extTimestamp = getExtTimeStamp();
 		if (baseTimestamp == null) {
--- rt.equinox.p2/bundles/org.eclipse.equinox.p2.reconciler.dropins/src/org/eclipse/equinox/internal/p2/reconciler/dropins/ProfileSynchronizer.java
+++ rt.equinox.p2/bundles/org.eclipse.equinox.p2.reconciler.dropins/src/org/eclipse/equinox/internal/p2/reconciler/dropins/ProfileSynchronizer.java
@@ -563,6 +563,7 @@
 
 		// get all IUs from all our repos 
 		IQueryResult<IInstallableUnit> allIUs = getAllIUsFromRepos();
+		HashSet<IInstallableUnit> removedFromAllIUs = new HashSet<IInstallableUnit>();
 		for (Iterator<IInstallableUnit> iter = allIUs.iterator(); iter.hasNext();) {
 			final IInstallableUnit iu = iter.next();
 			IInstallableUnit existing = profileIUs.get(iu);
@@ -576,6 +577,7 @@
 				// (and more expensive) way to find this out is to do an IU profile property query.
 				if (two == null) {
 					// the IU is already installed so don't mark it as a dropin now - see bug 404619.
+					removedFromAllIUs.add(iu);
 					iter.remove();
 					continue;
 				}
@@ -618,7 +620,7 @@
 			}
 			// if the IU from the profile is in the "all available" list, then it is already added
 			// otherwise if it isn't in the repo then we have to remove it from the profile.
-			if (!all.contains(iu))
+			if (!all.contains(iu) && !removedFromAllIUs.contains(iu))
 				toRemove.add(iu);
 		}
 
@@ -792,8 +794,8 @@
 			IStatus installerPlanStatus = engine.perform(plan.getInstallerPlan(), phaseSet, monitor);
 			if (!installerPlanStatus.isOK())
 				return installerPlanStatus;
-
-			applyConfiguration(true);
+			if (isReconciliationApplicationRunning())
+				applyConfiguration(true);
 		}
 		return engine.perform(plan, phaseSet, monitor);
 	}
--- rt.equinox.p2/bundles/org.eclipse.equinox.p2.ui.sdk.scheduler/src/org/eclipse/equinox/internal/p2/ui/sdk/scheduler/migration/MigrationWizard.java.orig	2018-04-25 20:31:57.931223008 +0100
+++ rt.equinox.p2/bundles/org.eclipse.equinox.p2.ui.sdk.scheduler/src/org/eclipse/equinox/internal/p2/ui/sdk/scheduler/migration/MigrationWizard.java	2018-04-25 20:32:11.069144336 +0100
@@ -151,7 +151,7 @@
 
 	@Override
 	public boolean performCancel() {
-		String[] buttons = new String[] {IDialogConstants.YES_LABEL, ProvUIMessages.MigrationPage_LATER_BUTTON, IDialogConstants.NO_LABEL};
+		String[] buttons = new String[] {IDialogConstants.YES_LABEL, IDialogConstants.NO_LABEL};
 		MessageDialog dialog = new MessageDialog(getShell(), ProvUIMessages.MigrationPage_CONFIRMATION_TITLE, null, ProvUIMessages.MigrationPage_CONFIRMATION_DIALOG, MessageDialog.QUESTION, buttons, 2);
 
 		return rememberCancellationDecision(dialog.open());