diff -up authconfig-6.2.10/authinfo.py.byteconv authconfig-6.2.10/authinfo.py
--- authconfig-6.2.10/authinfo.py.byteconv	2015-05-11 16:50:15.608497236 +0200
+++ authconfig-6.2.10/authinfo.py	2015-05-11 16:51:56.303867029 +0200
@@ -904,9 +904,9 @@ def feedFork(command, echo, query, respo
 	if not pid:
 		# child
 		if query:
-			child = Popen([command], shell=True)
+			child = Popen([command], shell=True, universal_newlines=True)
 		else:
-			child = Popen([command], stdin=PIPE, shell=True)
+			child = Popen([command], stdin=PIPE, shell=True, universal_newlines=True)
 			child.communicate(input=(response or '')+'\n')
 
 		# wait for the child to terminate & set the returncode
@@ -1005,8 +1005,8 @@ def isEmptyDir(path):
 
 def callPKCS11Setup(options):
 	try:
-		child = Popen([PATH_SCSETUP] + options, stdout=PIPE)
-		lst = child.communicate()[0].split(b"\n")
+		child = Popen([PATH_SCSETUP] + options, stdout=PIPE, universal_newlines=True)
+		lst = child.communicate()[0].split("\n")
 		if child.returncode != 0:
 			return None
 		if lst[-1] == '':
@@ -1940,7 +1940,7 @@ class AuthInfo:
 		if rmactions == None:
 			return False
 		for action in rmactions:
-			if b"lockhelper.sh" in action:
+			if "lockhelper.sh" in action:
 				lock = True
 		if lock:
 			self.setParam("smartcardAction", _("Lock"), ref)
@@ -4310,11 +4310,12 @@ class AuthInfo:
 			
 			if echo:
 				sys.stderr.write("[%s]\n" % cmd)
-				child = Popen([cmd], shell=True)
+			if self.joinPassword or not echo:
+				status, error = feedFork(cmd, echo, "sword:", self.joinPassword)
+			else:
+				child = Popen([cmd], shell=True, universal_newlines=True)
 				child.communicate()
 				status = child.returncode
-			else:
-				status, error = feedFork(cmd, echo, "sword:", self.joinPassword)
 			if echo:
 				if status != 0:
 					self.messageCB(_("Winbind domain join was not successful."))
@@ -4347,7 +4348,7 @@ class AuthInfo:
 
 			if echo:
 				sys.stderr.write("[%s]\n" % cmd)
-				child = Popen([cmd], shell=True)
+				child = Popen([cmd], shell=True, universal_newlines=True)
 				child.communicate()
 				status = child.returncode
 			else:
@@ -4366,7 +4367,7 @@ class AuthInfo:
 		return status == 0
 
 	def uninstallIPA(self):
-		cmd = PATH_IPA_CLIENT_INSTALL + " --uninstall --noac"
+		cmd = PATH_IPA_CLIENT_INSTALL + " --uninstall --noac --unattended"
 		os.system(cmd)
 
 	def toggleCachingService(self, nostart):
@@ -4486,7 +4487,7 @@ class AuthInfo:
 		try:
 			readf = request.urlopen(self.ldapCacertURL)
 			writef = openLocked(self.ldapCacertDir + "/" + LDAP_CACERT_DOWNLOADED, 0o644)
-			writef.write(readf.read())
+			writef.write(readf.read().decode())
 			readf.close()
 			writef.close()
 		except (IOError, OSError, ValueError):