diff --git a/mambabase/WelcomePage.ui b/mambabase/WelcomePage.ui
index 1118a67..0ef0c6b 100644
--- a/mambabase/WelcomePage.ui
+++ b/mambabase/WelcomePage.ui
@@ -144,17 +144,30 @@
         <bool>true</bool>
        </property>
       </widget>
-      <widget class="QLabel" name="label_5">
+      <widget class="QLabel" name="progressLabel">
        <property name="geometry">
         <rect>
          <x>10</x>
          <y>180</y>
-         <width>321</width>
+         <width>531</width>
          <height>20</height>
         </rect>
        </property>
        <property name="text">
-        <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;&lt;span style=&quot; font-weight:600;&quot;&gt;Please, press the Next button to continue.&lt;/span&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+        <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;&lt;br/&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+       </property>
+      </widget>
+      <widget class="QProgressBar" name="progressBar">
+       <property name="geometry">
+        <rect>
+         <x>10</x>
+         <y>150</y>
+         <width>531</width>
+         <height>23</height>
+        </rect>
+       </property>
+       <property name="value">
+        <number>0</number>
        </property>
       </widget>
      </widget>
diff --git a/mambabase/mambabase.py b/mambabase/mambabase.py
index eb6dd9b..365cdee 100755
--- a/mambabase/mambabase.py
+++ b/mambabase/mambabase.py
@@ -18,6 +18,61 @@ from gi.repository import PackageKitGlib as packagekit
 
 DATADIR = os.path.dirname(os.path.realpath((__file__))) + "/"
 
+
+class MambabaseWizard(QtWidgets.QWizard):
+    def __init__(self, parent=None):
+        super(MambabaseWizard, self).__init__(parent)
+        self.welcomePage = WelcomePage(self)
+        self.addPage(self.welcomePage)
+        self.selectGroupsPage = SelectGroupsPage(self)
+        self.addPage(self.selectGroupsPage)
+        self.selectExtraPage = SelectExtraPage(self)
+        self.addPage(self.selectExtraPage)
+        self.installationPage = InstallationPage(self)
+        self.addPage(self.installationPage)
+        self.finishPage = FinishPage(self)
+        self.addPage(self.finishPage)
+        self.setWindowTitle(_("openmamba base network installations") +
+            " - openmamba.org")
+        self.setFixedSize(571,465)
+        self.currentIdChanged.connect(self.currentIdChangedSlot)
+        self.prepareThread = PrepareThread(self)
+        self.installThread = InstallThread(self, self.selectGroupsPage.pkggroups)
+
+    def currentIdChangedSlot(self, currentId):
+        if currentId == 0:
+            self.prepareThread.start()
+        elif currentId == 3:
+            self.installThread.start()
+
+
+class PrepareThread(QtCore.QThread):
+    parent = None
+    doneSignal = QtCore.pyqtSignal()
+    updateProgressSignal = QtCore.pyqtSignal(dict)
+
+    def __init__(self, parent=None):
+        super(PrepareThread, self).__init__(parent)
+        self.parent = parent
+        self.doneSignal.connect(parent.welcomePage.completeChanged)
+        self.updateProgressSignal.connect(
+            parent.welcomePage.updateProgressSlot)
+
+    def run(self):
+        # Update packages list
+        self.updateProgressSignal.emit({ 'value': 5,
+            'label': _("Checking installed packages...")})
+        self.parent.selectGroupsPage.loadPkgGroups()
+        self.updateProgressSignal.emit({ 'value': 55,
+            'label': _("Checking installed extra components...")})
+        self.parent.selectExtraPage.setExtras()
+        self.updateProgressSignal.emit({ 'value': 100,
+            'label': _("Done. Please, press the Next button to continue.")})
+        # Enable back and next buttons
+        self.parent.welcomePage.done = True
+        self.doneSignal.emit()
+
+
 class InstallThread(QtCore.QThread):
     parent = None
     doneSignal = QtCore.pyqtSignal()
@@ -62,7 +117,7 @@ class InstallThread(QtCore.QThread):
         self.updateProgressSignal.emit({ 'value': 10,
             'label': _("Updating installed packages...")})
 
-        result = subprocess.run(['pkcon', 'update'],
+        result = subprocess.run(['pkcon', 'update', '-y'],
             stdout=subprocess.PIPE, stderr=subprocess.PIPE)
         if result.returncode == 0:
             if result.stdout:
@@ -144,35 +199,24 @@ class InstallThread(QtCore.QThread):
                 str(status.get_percentage())))})
 
 
-class MambabaseWizard(QtWidgets.QWizard):
-    def __init__(self, parent=None):
-        super(MambabaseWizard, self).__init__(parent)
-        self.addPage(WelcomePage(self))
-        self.selectGroupsPage = SelectGroupsPage(self)
-        self.addPage(self.selectGroupsPage)
-        self.selectExtraPage = SelectExtraPage(self)
-        self.addPage(self.selectExtraPage)
-        self.installationPage = InstallationPage(self)
-        self.addPage(self.installationPage)
-        self.finishPage = FinishPage(self)
-        self.addPage(self.finishPage)
-        self.setWindowTitle(_("openmamba base network installations") +
-            " - openmamba.org")
-        self.setFixedSize(571,465)
-        self.currentIdChanged.connect(self.currentIdChangedSlot)
-        self.installThread = InstallThread(self, self.selectGroupsPage.pkggroups)
-
-    def currentIdChangedSlot(self, currentId):
-        if currentId == 3:
-            self.installThread.start()
-
-
 class WelcomePage(QtWidgets.QWizardPage):
+    done = False
+
     def __init__(self, parent=None):
         super(WelcomePage, self).__init__(parent)
         uic.loadUi(DATADIR + "WelcomePage.ui", self)
         self.show()
 
+    def isComplete(self):
+        return self.done
+
+    @QtCore.pyqtSlot(dict)
+    def updateProgressSlot(self, dict):
+        if 'value' in dict:
+            self.progressBar.setValue(dict['value'])
+        if 'label' in dict:
+            self.progressLabel.setText(dict['label'])
+
 
 class SelectGroupsPage(QtWidgets.QWizardPage):
     groups_checkboxes = {}
@@ -181,7 +225,6 @@ class SelectGroupsPage(QtWidgets.QWizardPage):
     def __init__(self, parent=None):
         super(SelectGroupsPage, self).__init__(parent)
         uic.loadUi(DATADIR + "SelectGroupsPage.ui", self)
-        self.loadPkgGroups()
         self.show()
 
     def loadPkgGroups(self):
@@ -240,7 +283,6 @@ class SelectExtraPage(QtWidgets.QWizardPage):
         super(SelectExtraPage, self).__init__(parent)
         uic.loadUi(DATADIR + "SelectExtraPage.ui", self)
         self.setCommitPage(True)
-        self.setExtras()
         self.show()
 
     def setExtras(self):