diff -Nru python-acme-0.22.2/debian/changelog python-acme-0.22.2/debian/changelog
--- python-acme-0.22.2/debian/changelog 2018-03-21 04:45:24.000000000 +0000
+++ python-acme-0.22.2/debian/changelog 2018-11-25 15:09:41.000000000 +0000
@@ -1,3 +1,9 @@
+python-acme (0.22.2-1ubuntu0.16.04.1) xenial-proposed; urgency=medium
+
+  * Backport to Xenial for LE change (LP: #1640978)
+
+ -- Michael Casadevall <mcasadevall@ubuntu.com>  Sun, 25 Nov 2018 15:09:41 +0000
+
 python-acme (0.22.2-1) unstable; urgency=medium
 
   * New upstream release.
diff -Nru python-acme-0.22.2/debian/compat python-acme-0.22.2/debian/compat
--- python-acme-0.22.2/debian/compat    2018-03-17 15:24:35.000000000 +0000
+++ python-acme-0.22.2/debian/compat    2018-11-25 15:09:41.000000000 +0000
@@ -1 +1 @@
-11
+9
diff -Nru python-acme-0.22.2/debian/control python-acme-0.22.2/debian/control
--- python-acme-0.22.2/debian/control   2018-03-17 15:24:35.000000000 +0000
+++ python-acme-0.22.2/debian/control   2018-11-25 15:09:41.000000000 +0000
@@ -1,13 +1,14 @@
 Source: python-acme
 Section: python
 Priority: optional
-Maintainer: Debian Let's Encrypt <letsencrypt-devel@lists.alioth.debian.org>
+Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
+XSBC-Original-Maintainer: Debian Let's Encrypt <letsencrypt-devel@lists.alioth.debian.org>
 Uploaders: Harlan Lieberman-Berg <hlieberman@debian.org>,
            Francois Marier <francois@debian.org>
-Build-Depends: debhelper (>= 11~),
+Build-Depends: debhelper (>= 9~),
                dh-python,
                python-all (>= 2.7),
-               python-cryptography (>= 1.3.4),
+               python-cryptography,
                python-docutils,
                python-josepy,
                python-mock,
@@ -19,7 +20,7 @@
                python-six (>= 1.9),
                python-tz,
                python3 (>= 3.4),
-               python3-cryptography (>= 1.3.4),
+               python3-cryptography,
                python3-docutils,
                python3-josepy,
                python3-mock,
diff -Nru python-acme-0.22.2/debian/rules python-acme-0.22.2/debian/rules
--- python-acme-0.22.2/debian/rules     2018-03-17 15:24:35.000000000 +0000
+++ python-acme-0.22.2/debian/rules     2018-11-25 15:09:41.000000000 +0000
@@ -7,10 +7,7 @@
 
 override_dh_auto_build:
        dh_auto_build
-       PYTHONPATH=. \
-               http_proxy='127.0.0.1:9' \
-               https_proxy='127.0.0.1:9' \
-               sphinx-build -N -bhtml docs/ build/html
+       PYTHONPATH=. http_proxy='127.0.0.1:9' sphinx-build -N -bhtml docs/ build/html
 
 override_dh_auto_install:
        dh_auto_install