diff -Nru python-pip-1.5.4/debian/changelog python-pip-1.5.4/debian/changelog
--- python-pip-1.5.4/debian/changelog	2015-06-16 19:26:28.000000000 +0000
+++ python-pip-1.5.4/debian/changelog	2016-06-27 17:40:48.000000000 +0000
@@ -1,3 +1,10 @@
+python-pip (1.5.4-1ubuntu4) trusty-proposed; urgency=medium
+
+  * fix legacy resion format support (LP: #1445947):
+    - d/p/fix_legacy_version_format_support.patch
+
+ -- Liang Chen <liang.chen@canonical.com>  Mon, 27 Jun 2016 10:40:48 -0700
+
 python-pip (1.5.4-1ubuntu3) trusty-proposed; urgency=medium
 
   * d/control: Add missing versioned dependencies.
diff -Nru python-pip-1.5.4/debian/patches/fix_legacy_version_format_support.patch python-pip-1.5.4/debian/patches/fix_legacy_version_format_support.patch
--- python-pip-1.5.4/debian/patches/fix_legacy_version_format_support.patch	1970-01-01 00:00:00.000000000 +0000
+++ python-pip-1.5.4/debian/patches/fix_legacy_version_format_support.patch	2016-06-27 17:40:29.000000000 +0000
@@ -0,0 +1,23 @@
+From 6cab71f422f2425b4d2283023c9e955f9663dde6 Mon Sep 17 00:00:00 2001
+From: Donald Stufft <donald@stufft.io>
+Date: Sat, 20 Dec 2014 15:50:25 -0500
+Subject: [PATCH] Fix ``pip list`` when there is an invalid PEP 440 version
+ installed
+
+---
+ pip/__init__.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+Index: python-pip-1.5.4/pip/__init__.py
+===================================================================
+--- python-pip-1.5.4.orig/pip/__init__.py	2016-05-26 10:35:54.536398385 +0000
++++ python-pip-1.5.4/pip/__init__.py	2016-05-26 10:35:54.532398385 +0000
+@@ -283,7 +283,7 @@
+             editable = False
+             req = dist.as_requirement()
+             specs = req.specs
+-            assert len(specs) == 1 and specs[0][0] == '=='
++            assert len(specs) == 1 and specs[0][0] in ["==", "==="]
+             version = specs[0][1]
+             ver_match = cls._rev_re.search(version)
+             date_match = cls._date_re.search(version)
diff -Nru python-pip-1.5.4/debian/patches/series python-pip-1.5.4/debian/patches/series
--- python-pip-1.5.4/debian/patches/series	2015-06-05 18:46:43.000000000 +0000
+++ python-pip-1.5.4/debian/patches/series	2016-06-27 17:40:29.000000000 +0000
@@ -4,3 +4,4 @@
 better-error-message.patch
 scripttest-version.diff
 debian-771794.patch
+fix_legacy_version_format_support.patch