diff --git a/AUTHORS b/AUTHORS
new file mode 100644
index 0000000000000000000000000000000000000000..e7cb480cf4e2403ba037994dcb12cf51a124ba66
--- /dev/null
+++ b/AUTHORS
@@ -0,0 +1,2 @@
+Main developers:
+  Guillaume Benoit <guillaume@manjaro.org>
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000000000000000000000000000000000000..94a9ed024d3859793618152ea559a168bbcbb5e2
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/README b/README
new file mode 100644
index 0000000000000000000000000000000000000000..8b137891791fe96927ad78e64b0aad7bded08bdc
--- /dev/null
+++ b/README
@@ -0,0 +1 @@
+
diff --git a/TODO b/TODO
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/config.py b/config.py
index 0cde5964a2e275e69e7756ec980ad891ab502aeb..3e9572e9a22360be3f39831b40a04873e871753c 100644
--- a/config.py
+++ b/config.py
@@ -1,5 +1,5 @@
 #! /usr/bin/python
-# -*-coding:utf-8 -*
+# -*-coding:utf-8 -*-
 
 import io
 import os
@@ -10,7 +10,6 @@ import collections
 import warnings
 
 import pyalpm
-from transaction import ErrorDialog
 
 class InvalidSyntax(Warning):
 	def __init__(self, filename, problem, arg):
@@ -106,25 +105,6 @@ def pacman_conf_enumerator(path):
 			else:
 				warnings.warn(InvalidSyntax(f.name, 'unrecognized option', key))
 
-_logmask = pyalpm.LOG_ERROR | pyalpm.LOG_WARNING
-
-def cb_log(level, line):
-	if not (level & _logmask):
-		return
-	if level & pyalpm.LOG_ERROR:
-		ErrorDialog.format_secondary_text(line)
-		response = ErrorDialog.run()
-		if response:
-			ErrorDialog.hide()
-		line = "ERROR: " + line
-	elif level & pyalpm.LOG_WARNING:
-		line = "WARNING: " + line
-	elif level & pyalpm.LOG_DEBUG:
-		line = "DEBUG: " + line
-	elif level & pyalpm.LOG_FUNCTION:
-		line = "FUNC: " + line
-	sys.stderr.write(line)
-
 class PacmanConfig(object):
 	def __init__(self, conf = None, options = None):
 		self.options = {}
@@ -185,7 +165,6 @@ class PacmanConfig(object):
 			h.noextracts = self.options["NoExtract"]
 		if "NoUpgrade" in self.options:
 			h.noupgrades = self.options["NoUpgrade"]
-		h.logcb = cb_log
 
 		# set sync databases
 		for repo, servers in self.repos.items():
diff --git a/gui/dialogs.glade b/gui/dialogs.glade
index ba18a41c034e1279df19a58c09136512a3dc147a..4531d03f5a47d8278c41546b6e0a1cdc70686eff 100644
--- a/gui/dialogs.glade
+++ b/gui/dialogs.glade
@@ -142,11 +142,12 @@
     <property name="width_request">250</property>
     <property name="height_request">60</property>
     <property name="can_focus">False</property>
-    <property name="title" translatable="yes"> </property>
+    <property name="title" translatable="yes">Transaction progress</property>
     <property name="resizable">False</property>
     <property name="window_position">center-on-parent</property>
     <property name="default_width">250</property>
     <property name="default_height">60</property>
+    <signal name="delete-event" handler="on_ProgressWindow_delete_event" swapped="no"/>
     <child>
       <object class="GtkBox" id="box7">
         <property name="visible">True</property>
@@ -186,6 +187,70 @@
       </object>
     </child>
   </object>
+  <object class="GtkMessageDialog" id="QuestionDialog">
+    <property name="can_focus">False</property>
+    <property name="border_width">5</property>
+    <property name="title" translatable="yes"> </property>
+    <property name="resizable">False</property>
+    <property name="window_position">center-on-parent</property>
+    <property name="type_hint">dialog</property>
+    <property name="skip_taskbar_hint">True</property>
+    <property name="message_type">question</property>
+    <property name="buttons">yes-no</property>
+    <child internal-child="vbox">
+      <object class="GtkBox" id="messagedialog-vbox8">
+        <property name="can_focus">False</property>
+        <property name="orientation">vertical</property>
+        <property name="spacing">2</property>
+        <child internal-child="action_area">
+          <object class="GtkButtonBox" id="messagedialog-action_area8">
+            <property name="can_focus">False</property>
+          </object>
+          <packing>
+            <property name="expand">False</property>
+            <property name="fill">True</property>
+            <property name="pack_type">end</property>
+            <property name="position">0</property>
+          </packing>
+        </child>
+        <child>
+          <placeholder/>
+        </child>
+      </object>
+    </child>
+  </object>
+  <object class="GtkMessageDialog" id="WarningDialog">
+    <property name="can_focus">False</property>
+    <property name="border_width">5</property>
+    <property name="title" translatable="yes"> </property>
+    <property name="resizable">False</property>
+    <property name="window_position">center-on-parent</property>
+    <property name="type_hint">dialog</property>
+    <property name="skip_taskbar_hint">True</property>
+    <property name="message_type">warning</property>
+    <property name="buttons">ok</property>
+    <child internal-child="vbox">
+      <object class="GtkBox" id="messagedialog-vbox7">
+        <property name="can_focus">False</property>
+        <property name="orientation">vertical</property>
+        <property name="spacing">2</property>
+        <child internal-child="action_area">
+          <object class="GtkButtonBox" id="messagedialog-action_area7">
+            <property name="can_focus">False</property>
+          </object>
+          <packing>
+            <property name="expand">False</property>
+            <property name="fill">True</property>
+            <property name="pack_type">end</property>
+            <property name="position">0</property>
+          </packing>
+        </child>
+        <child>
+          <placeholder/>
+        </child>
+      </object>
+    </child>
+  </object>
   <object class="GtkListStore" id="transaction_desc">
     <columns>
       <!-- column-name action -->
diff --git a/pamac.py b/pamac.py
index 0c1ddd60d74c259926738820041385ff222f5554..0473aafe466623afe1ad55496168ae0486f2ff60 100755
--- a/pamac.py
+++ b/pamac.py
@@ -1,5 +1,5 @@
 #! /usr/bin/python
-# -*-coding:utf-8 -*
+# -*-coding:utf-8 -*-
 
 from gi.repository import Gtk, GdkPixbuf, Gdk, GObject
 
@@ -44,7 +44,6 @@ list_dict = None
 current_group = None
 transaction_type = None
 transaction_dict = {}
-t = None
 
 def set_list_dict_search(*patterns):
 	global pkg_name_list
@@ -188,6 +187,9 @@ def set_desc(pkg, style):
 			package_desc.append(['Backup files:', '\n'.join(["%s %s" % (md5, file) for (file, md5) in pkg.backup])])
 
 class Handler:
+	def on_ProgressWindow_delete_event(self, *arg):
+		pass
+
 	def on_MainWindow_delete_event(self, *arg):
 		Gtk.main_quit()
 
@@ -208,36 +210,52 @@ class Handler:
 			response = transaction.ErrorDialog.run()
 			if response:
 				transaction.ErrorDialog.hide()
-		else: 
-			t = transaction.init_transaction(config.handle)
-			if transaction_type is "install":
-				for pkg in transaction_dict.values():
-					t.add_pkg(pkg)
-			if transaction_type is "remove":
-				for pkg in transaction_dict.values():
-					t.remove_pkg(pkg)
-			try:
-				t.prepare()
-			except pyalpm.error:
-				transaction.ErrorDialog.format_secondary_text(traceback.format_exc())
-				response = transaction.ErrorDialog.run()
-				if response:
-					transaction.ErrorDialog.hide()
-				t.release()
-			transaction.to_remove = t.to_remove
-			transaction.to_add = t.to_add
-			transaction.set_transaction_desc('normal')
-			response = transaction.ConfDialog.run()
-			if response == Gtk.ResponseType.OK:
-				transaction.t_finalize(t)
-				transaction_dict.clear()
-				transaction_type = None
-				set_packages_list()
-				transaction.ProgressWindow.hide()
-			if response == Gtk.ResponseType.CANCEL or Gtk.ResponseType.CLOSE or Gtk.ResponseType.DELETE_EVENT:
-				transaction.ProgressWindow.hide()
-				transaction.ConfDialog.hide()
-				t.release()
+		else:
+			if transaction.t_lock is True:
+				pass
+			else:
+				transaction.t = transaction.init_transaction(config.handle, cascade = True)
+				if transaction_type is "install":
+					for pkg in transaction_dict.values():
+						transaction.t.add_pkg(pkg)
+				if transaction_type is "remove":
+					for pkg in transaction_dict.values():
+						transaction.t.remove_pkg(pkg)
+				transaction.check_conflicts()
+				if transaction.conflict_to_remove:
+					for pkg in transaction.conflict_to_remove.values():
+						transaction.t.remove_pkg(pkg)
+				try:
+					transaction.t.prepare()
+				except pyalpm.error:
+					transaction.ErrorDialog.format_secondary_text(traceback.format_exc())
+					response = transaction.ErrorDialog.run()
+					if response:
+						transaction.ErrorDialog.hide()
+					transaction.t.release()
+					transaction.t_lock = False
+				transaction.to_remove = transaction.t.to_remove
+				transaction.to_add = transaction.t.to_add
+				transaction.set_transaction_desc('normal')
+				response = transaction.ConfDialog.run()
+				if response == Gtk.ResponseType.OK:
+					transaction.ConfDialog.hide()
+					try:
+						transaction.t.commit()
+					except pyalpm.error:
+						transaction.ErrorDialog.format_secondary_text(traceback.format_exc())
+						response = transaction.ErrorDialog.run()
+						if response:
+							transaction.ErrorDialog.hide()
+					transaction_dict.clear()
+					transaction_type = None
+					set_packages_list()
+					transaction.ProgressWindow.hide()
+				if response == Gtk.ResponseType.CANCEL or Gtk.ResponseType.CLOSE or Gtk.ResponseType.DELETE_EVENT:
+					transaction.ProgressWindow.hide()
+					transaction.ConfDialog.hide()
+					transaction.t.release()
+					transaction.t_lock = False
 
 	def on_EraseButton_clicked(self, *arg):
 		global transaction_type
diff --git a/pamac_update.py b/pamac_update.py
index 0b9830189925caafe5d43262cb2a559dd6828db5..ccdc386c69f3fa70da2a6ac8bda0aec49309dffa 100755
--- a/pamac_update.py
+++ b/pamac_update.py
@@ -1,5 +1,5 @@
 #! /usr/bin/python
-# -*-coding:utf-8 -*
+# -*-coding:utf-8 -*-
 
 from gi.repository import Gtk, GdkPixbuf, Gdk
 
@@ -45,6 +45,9 @@ class Handler:
 		transaction.do_refresh()
 		have_updates()
 
+	def on_ProgressWindow_delete_event(self, *arg):
+		pass
+
 def main():
 	update = have_updates()
 	top_label.set_justify(Gtk.Justification.CENTER)
diff --git a/transaction.py b/transaction.py
index 4febc06b0eed27b3fbfea3add60c3723a5a03ae3..78b6bb41b52d1c6a2af08aab4e8f5eedf9d9c3e2 100755
--- a/transaction.py
+++ b/transaction.py
@@ -1,10 +1,11 @@
 #! /usr/bin/python
-# -*-coding:utf-8 -*
+# -*-coding:utf-8-*-
 
 from gi.repository import Gtk
 
 import pyalpm
 import traceback
+import sys
 import config
 
 interface = Gtk.Builder()
@@ -14,26 +15,35 @@ ProgressWindow = interface.get_object('ProgressWindow')
 progress_bar = interface.get_object('progressbar2')
 progress_label = interface.get_object('progresslabel2')
 ErrorDialog = interface.get_object('ErrorDialog')
+WarningDialog = interface.get_object('WarningDialog')
+QuestionDialog = interface.get_object('QuestionDialog')
 ConfDialog = interface.get_object('ConfDialog')
 transaction_desc = interface.get_object('transaction_desc')
 down_label = interface.get_object('down_label')
 
+t = None
+t_lock = False
+conflict_to_remove = None
 to_remove = None
 to_add = None
 to_update = None
 do_syncfirst = False
 list_first = []
 
-def init_transaction(handle):
+def init_transaction(handle, **options):
 	"Transaction initialization"
+	global t_lock
 	handle.dlcb = cb_dl
 	handle.totaldlcb = totaldlcb
 	handle.eventcb = cb_event
 	handle.questioncb = cb_conv
 	handle.progresscb = cb_progress
+	handle.logcb = cb_log
 	try:
-		t = handle.init_transaction(cascade = True)
-		return t
+		_t = handle.init_transaction(**options)
+		print(_t.flags)
+		t_lock = True
+		return _t
 	except pyalpm.error:
 		ErrorDialog.format_secondary_text(traceback.format_exc())
 		response = ErrorDialog.run()
@@ -41,56 +51,89 @@ def init_transaction(handle):
 			ErrorDialog.hide()
 		return False
 
+def check_conflicts():
+	global conflict_to_remove
+	conflict_to_remove = {}
+	installed_conflicts = {}
+	for pkg in config.handle.get_localdb().pkgcache:
+		if pkg.conflicts:
+			installed_conflicts[pkg.name] = pkg.conflicts
+	targets_conflicts = {}
+	targets_replaces = {}
+	for pkg in t.to_add:
+		if pkg.replaces:
+			targets_replaces[pkg.name] = pkg.replaces
+		if pkg.conflicts:
+			targets_conflicts[pkg.name] = pkg.conflicts
+	warning = ''
+	if targets_replaces:
+		for key, value in targets_replaces.items():
+			for name in value:
+				pkg = config.handle.get_localdb().get_pkg(name)
+				if pkg:
+					if not pkg.name in conflict_to_remove.keys():
+						conflict_to_remove[pkg.name] = pkg
+						if warning:
+							warning = warning+'\n'
+						warning = warning+pkg.name+' will be replaced by '+key 
+	if targets_conflicts:
+		for key, value in targets_conflicts.items():
+			for name in value:
+				pkg = config.handle.get_localdb().get_pkg(name)
+				if pkg:
+					if not pkg.name in conflict_to_remove.keys():
+						conflict_to_remove[pkg.name] = pkg
+	if installed_conflicts:
+		for key, value in installed_conflicts.items():
+			for name in value:
+				for pkg in t.to_add:
+					if pkg.name == name:
+						if not pkg.name in conflict_to_remove.keys():
+							conflict_to_remove[pkg.name] = pkg
+	if conflict_to_remove:
+		WarningDialog.format_secondary_text(warning)
+		response = WarningDialog.run()
+		if response:
+			WarningDialog.hide()
+
 def do_refresh():
 	"""Sync databases like pacman -Sy"""
+	global t
+	global t_lock
 	ProgressWindow.show_all()
 	for db in config.handle.get_syncdbs():
-		t = init_transaction(config.handle)
-		try:
-			db.update(force=False)
-		except pyalpm.error:
-			ErrorDialog.format_secondary_text(traceback.format_exc())
-			response = ErrorDialog.run()
-			if response:
-				ErrorDialog.hide()
-		t.release()
+		if t_lock is False:
+			t = init_transaction(config.handle)
+			try:
+				db.update(force=False)
+				t.release()
+				t_lock = False
+			except pyalpm.error:
+				ErrorDialog.format_secondary_text(traceback.format_exc())
+				response = ErrorDialog.run()
+				if response:
+					ErrorDialog.hide()
+				t_lock = False
+				break
 	ProgressWindow.hide()
 	progress_label.set_text('')
 	progress_bar.set_text('')
 
 def do_sysupgrade():
 	"""Upgrade a system like pacman -Su"""
+	global t
+	global t_lock
 	global to_remove
 	global to_add
 	global to_update
-	t = init_transaction(config.handle)
-	if do_syncfirst is True:
-		for pkg in list_first:
-			t.add_pkg(pkg)
-	else:
-		try:
-			t.sysupgrade(downgrade=False)
-		except pyalpm.error:
-			ErrorDialog.format_secondary_text(traceback.format_exc())
-			response = ErrorDialog.run()
-			if response:
-				ErrorDialog.hide()
-			t.release()
-	try:
-		t.prepare()
-	except pyalpm.error:
-		ErrorDialog.format_secondary_text(traceback.format_exc())
-		response = ErrorDialog.run()
-		if response:
-			ErrorDialog.hide()
-		t.release()
-	to_remove = t.to_remove
-	to_add = t.to_add
-	if len(to_add) + len(to_remove) == 0:
-		t.release()
-	else:
-		set_transaction_desc('update')
-		if len(transaction_desc) != 0:
+	if t_lock is False:
+		if do_syncfirst is True:
+			t = init_transaction(config.handle, recurse = True)
+			for pkg in list_first:
+				t.add_pkg(pkg)
+			to_remove = t.to_remove
+			to_add = t.to_add
+			set_transaction_desc('update')
 			response = ConfDialog.run()
 			if response == Gtk.ResponseType.OK:
 				t_finalize(t)
@@ -98,12 +141,61 @@ def do_sysupgrade():
 				ProgressWindow.hide()
 				ConfDialog.hide()
 				t.release()
+				t_lock = False
 		else:
-			t_finalize(t)
-			t.release()
+			try:
+				t = init_transaction(config.handle)
+				t.sysupgrade(downgrade=False)
+			except pyalpm.error:
+				ErrorDialog.format_secondary_text(traceback.format_exc())
+				response = ErrorDialog.run()
+				if response:
+					ErrorDialog.hide()
+				t.release()
+				t_lock = False
+			check_conflicts()
+			to_add = t.to_add
+			to_remove = []
+			for pkg in conflict_to_remove.values():
+				to_remove.append(pkg)
+			if len(to_add) + len(to_remove) == 0:
+				t.release()
+				print("Nothing to update")
+			else:
+				t.release()
+				t = init_transaction(config.handle, noconflicts = True, nodeps = True, nodepversion = True)
+				for pkg in to_add:
+					t.add_pkg(pkg)
+				for pkg in conflict_to_remove.values():
+					t.remove_pkg(pkg)
+				to_remove = t.to_remove
+				to_add = t.to_add
+				set_transaction_desc('update')
+				if len(transaction_desc) != 0:
+					response = ConfDialog.run()
+					if response == Gtk.ResponseType.OK:
+								t_finalize(t)
+					if response == Gtk.ResponseType.CANCEL or Gtk.ResponseType.CLOSE or Gtk.ResponseType.DELETE_EVENT:
+						ProgressWindow.hide()
+						ConfDialog.hide()
+						t.release()
+						t_lock = False
+				else:
+					t_finalize(t)
+					t.release()
+					t_lock = False
 
 def t_finalize(t):
-	ConfDialog.hide() 
+	ConfDialog.hide()
+	try:
+		t.prepare()
+	except pyalpm.error:
+		ErrorDialog.format_secondary_text(traceback.format_exc())
+		response = ErrorDialog.run()
+		if response:
+			ErrorDialog.hide()
+		t.release()
+		t_lock = False
 	try:
 		t.commit()
 	except pyalpm.error:
@@ -165,17 +257,16 @@ def set_transaction_desc(mode):
 			i += 1
 		down_label.set_markup('')
 	if to_add:
-		if mode == 'update':
-			installed_name = []
-			for pkg_object in config.handle.get_localdb().pkgcache:
-				installed_name.append(pkg_object.name)
-			to_add_name = []
-			for pkg_object in to_add:
-				to_add_name.append(pkg_object.name)
-			to_update = sorted(set(installed_name).intersection(to_add_name))
-			to_remove_from_add_name = sorted(set(to_update).intersection(to_add_name))
-			for name in to_remove_from_add_name:
-					to_add_name.remove(name)
+		installed_name = []
+		for pkg_object in config.handle.get_localdb().pkgcache:
+			installed_name.append(pkg_object.name)
+		to_add_name = []
+		for pkg_object in to_add:
+			to_add_name.append(pkg_object.name)
+		to_update = sorted(set(installed_name).intersection(to_add_name))
+		to_remove_from_add_name = sorted(set(to_update).intersection(to_add_name))
+		for name in to_remove_from_add_name:
+			to_add_name.remove(name)
 		if to_add_name:
 			transaction_desc.append(['To install:', to_add_name[0]])
 			i = 1
@@ -190,7 +281,7 @@ def set_transaction_desc(mode):
 					transaction_desc.append([' ', to_update[i]])
 					i += 1
 		down_label.set_markup('')
-		#down_label.set_markup('<b>Total Download size: </b>'+format_size(total_size))
+	#	down_label.set_markup('<b>Total Download size: </b>'+format_size(totaldlcb))
 
 # Callbacks
 event_text = ' '
@@ -202,7 +293,6 @@ def cb_event(ID, event, tupel):
 	for i in [1,3,5,7,9,11,15]:
 		if ID is i:
 			progress_label.set_text(event)
-			print(event)
 			break
 		else :
 			progress_label.set_text(' ')
@@ -211,10 +301,40 @@ def cb_event(ID, event, tupel):
 		print('Downloading a file')
 	progress_bar.set_fraction(0.0)
 	progress_bar.set_text('')
+	print(ID,event)
 
 def cb_conv(*args):
 	print("conversation", args)
 
+_logmask = pyalpm.LOG_ERROR | pyalpm.LOG_WARNING
+
+def cb_log(level, line):
+	#global t
+	#try:
+	#	_line = str(_line, encoding='utf-8').strip("\n")
+	#except:
+	#	_line = str(_line, encoding='latin-1').strip("\n")
+	if not (level & _logmask):
+		return
+	if level & pyalpm.LOG_ERROR:
+		ErrorDialog.format_secondary_text("ERROR: "+line)
+		response = ErrorDialog.run()
+		if response:
+			ErrorDialog.hide()
+			#t.release()
+	elif level & pyalpm.LOG_WARNING:
+		WarningDialog.format_secondary_text("WARNING: "+line)
+		response = WarningDialog.run()
+		if response:
+			WarningDialog.hide()
+	elif level & pyalpm.LOG_DEBUG:
+		line = "DEBUG: " + line
+		print(line)
+	elif level & pyalpm.LOG_FUNCTION:
+		line = "FUNC: " + line
+		print(line)
+	#sys.stderr.write(line)
+
 total_size = 0
 def totaldlcb(_total_size):
 	global total_size