diff -Nru libnl3-3.2.21/debian/changelog libnl3-3.2.21/debian/changelog
--- libnl3-3.2.21/debian/changelog	2016-01-28 10:19:00.000000000 -0600
+++ libnl3-3.2.21/debian/changelog	2016-02-04 03:56:32.000000000 -0600
@@ -1,3 +1,11 @@
+libnl3 (3.2.21-1ubuntu2) trusty; urgency=medium
+
+  * debian/control: Breaks: network-manager (<< 0.9.8.8-0ubuntu7.3)
+    Ensure users don't install broken network-manager (LP: #1539634)
+  * debian/libnl-3-200.symbols: mark new private symbols as optional
+
+ -- Ryan Harper <ryan.harper@canonical.com>  Thu, 04 Feb 2016 02:29:55 -0600
+
 libnl3 (3.2.21-1ubuntu1) trusty; urgency=low
 
   * Apply backported upstream patches (Closes: LP: #1511735)
diff -Nru libnl3-3.2.21/debian/control libnl3-3.2.21/debian/control
--- libnl3-3.2.21/debian/control	2016-01-28 10:18:57.000000000 -0600
+++ libnl3-3.2.21/debian/control	2016-02-04 02:29:45.000000000 -0600
@@ -14,6 +14,7 @@
 Section: libs
 Pre-Depends: ${misc:Pre-Depends}
 Depends: ${misc:Depends}, ${shlibs:Depends}
+Breaks: network-manager (<< 0.9.8.8-0ubuntu7.3)
 Multi-Arch: same
 Description: library for dealing with netlink sockets 
  This is a library for applications dealing with netlink sockets.
diff -Nru libnl3-3.2.21/debian/libnl-3-200.symbols libnl3-3.2.21/debian/libnl-3-200.symbols
--- libnl3-3.2.21/debian/libnl-3-200.symbols	2016-01-28 10:18:57.000000000 -0600
+++ libnl3-3.2.21/debian/libnl-3-200.symbols	2016-02-04 05:06:55.000000000 -0600
@@ -10,10 +10,10 @@
  __trans_list_add@Base 3.2.7
  __trans_list_clear@Base 3.2.7
  __type2str@Base 3.2.7
- _nl_socket_generate_local_port_no_release@Base 3.2.21-1ubuntu1
- _nl_socket_is_local_port_unspecified@Base 3.2.21-1ubuntu1
- _nl_socket_used_ports_release_all@Base 3.2.21-1ubuntu1
- _nl_socket_used_ports_set@Base 3.2.21-1ubuntu1
+ (optional)"_nl_socket_is_local_port_unspecified@Base" 3.2.21-1ubuntu1
+ (optional)"_nl_socket_set_local_port_no_release@Base" 3.2.21-1ubuntu1
+ (optional)"_nl_socket_used_ports_release_all@Base" 3.2.21-1ubuntu1
+ (optional)"_nl_socket_used_ports_set@Base" 3.2.21-1ubuntu1
  dump_from_ops@Base 3.2.7
  nl_addr2str@Base 3.2.7
  nl_addr_alloc@Base 3.2.7