diff -Nru gthumb-3.3.1.is.3.2.7/debian/changelog gthumb-3.3.1.is.3.2.7/debian/changelog
--- gthumb-3.3.1.is.3.2.7/debian/changelog	2014-04-08 00:46:36.000000000 +0400
+++ gthumb-3.3.1.is.3.2.7/debian/changelog	2017-07-21 12:31:10.000000000 +0300
@@ -1,3 +1,10 @@
+gthumb (3:3.3.1.is.3.2.7-0ubuntu2) UNRELEASED; urgency=medium
+
+  * 15-fix-open-second-instance.patch: new patch. Fixes opening
+    second instance of gthumb.
+
+ -- Vlad Orlov <monsta@inbox.ru>  Fri, 21 Jul 2017 12:29:22 +0300
+
 gthumb (3:3.3.1.is.3.2.7-0ubuntu1) trusty; urgency=medium
 
   * Revert to newest upstream stable release. LP: #1290691
diff -Nru gthumb-3.3.1.is.3.2.7/debian/patches/15-fix-open-second-instance.patch gthumb-3.3.1.is.3.2.7/debian/patches/15-fix-open-second-instance.patch
--- gthumb-3.3.1.is.3.2.7/debian/patches/15-fix-open-second-instance.patch	1970-01-01 03:00:00.000000000 +0300
+++ gthumb-3.3.1.is.3.2.7/debian/patches/15-fix-open-second-instance.patch	2017-07-21 12:32:19.000000000 +0300
@@ -0,0 +1,23 @@
+From e99664c67254fee3df1b53caa2e2a67b0bb86576 Mon Sep 17 00:00:00 2001
+From: Paolo Bacchilega <paobac@src.gnome.org>
+Date: Sun, 19 Jan 2014 18:27:28 +0100
+Subject: set G_APPLICATION_HANDLES_COMMAND_LINE for the application
+
+[bug #728341]
+---
+ gthumb/main.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+Index: gthumb-3.3.1.is.3.2.7/gthumb/main.c
+===================================================================
+--- gthumb-3.3.1.is.3.2.7.orig/gthumb/main.c	2017-07-21 12:32:16.262215229 +0300
++++ gthumb-3.3.1.is.3.2.7/gthumb/main.c	2017-07-21 12:32:16.242215229 +0300
+@@ -716,7 +716,7 @@
+         return g_object_new (gth_application_get_type (),
+                              "application-id", "org.gnome.Gthumb",
+                              "register-session", TRUE, /* required to call gtk_application_inhibit */
+-                             "flags", 0,
++                             "flags", G_APPLICATION_HANDLES_COMMAND_LINE,
+                              NULL);
+ }
+ 
diff -Nru gthumb-3.3.1.is.3.2.7/debian/patches/series gthumb-3.3.1.is.3.2.7/debian/patches/series
--- gthumb-3.3.1.is.3.2.7/debian/patches/series	2014-01-25 01:00:43.000000000 +0400
+++ gthumb-3.3.1.is.3.2.7/debian/patches/series	2017-07-21 12:32:02.000000000 +0300
@@ -5,3 +5,4 @@
 07-fix_documentation_xml.patch
 10-fix_POTFILES.skip.patch
 14-unity_control_center.patch
+15-fix-open-second-instance.patch