=== modified file 'debian/changelog'
--- debian/changelog	2015-03-25 13:33:50 +0000
+++ debian/changelog	2015-03-30 13:01:46 +0000
@@ -1,3 +1,10 @@
+python3.4 (3.4.3-3ubuntu1) UNRELEASED; urgency=medium
+
+  * d/patches/missing-ensurepip-message.diff: Print a helpful message when
+    ensurepip invocation fails.
+
+ -- Barry Warsaw <barry@ubuntu.com>  Mon, 30 Mar 2015 09:00:38 -0400
+
 python3.4 (3.4.3-3) vivid; urgency=medium
 
   * Relax the version check for mpdecimal (all required patches applied

=== added file 'debian/patches/missing-ensurepip-message.diff'
--- debian/patches/missing-ensurepip-message.diff	1970-01-01 00:00:00 +0000
+++ debian/patches/missing-ensurepip-message.diff	2015-03-30 13:00:04 +0000
@@ -0,0 +1,20 @@
+Description: Print a (hopefully) helpful message when pyvenv setup invokes
+ the ensurepip module.
+Author: Barry Warsaw <barry@ubuntu.com>
+
+--- a/Lib/venv/__init__.py
++++ b/Lib/venv/__init__.py
+@@ -254,7 +254,12 @@
+         # intended for the global Python environment
+         cmd = [context.env_exe, '-Im', 'ensurepip', '--upgrade',
+                                                     '--default-pip']
+-        subprocess.check_output(cmd, stderr=subprocess.STDOUT)
++        try:
++            subprocess.check_output(cmd, stderr=subprocess.STDOUT)
++        except subprocess.CalledProcessError:
++            print("""\
++pyvenv in Debian/Ubuntu requires the python3-venv package to be installed.""")
++            raise
+ 
+     def setup_scripts(self, context):
+         """

=== modified file 'debian/patches/series'
--- debian/patches/series	2015-03-25 13:33:50 +0000
+++ debian/patches/series	2015-03-30 12:56:19 +0000
@@ -38,3 +38,4 @@
 ensurepip-disabled.diff
 mpdecimal-version.diff
 mangle-fstack-protector.diff
+missing-ensurepip-message.diff