diff -Nru apport-2.20.7/data/apport apport-2.20.7/data/apport
--- apport-2.20.7/data/apport	2017-11-17 15:58:31.000000000 +0000
+++ apport-2.20.7/data/apport	2017-12-13 18:49:58.000000000 +0000
@@ -15,6 +15,7 @@
 
 import sys, os, os.path, subprocess, time, traceback, pwd, io
 import signal, inspect, grp, fcntl, socket, atexit, array, struct
+import errno
 
 import apport, apport.fileutils
 
@@ -298,13 +299,19 @@
 
 
 def is_same_ns(pid, ns):
-    if not os.path.exists('/proc/self/ns/%s' % ns):
+    if not os.path.exists('/proc/self/ns/%s' % ns) or \
+            not os.path.exists('/proc/%s/ns/%s' % (pid, ns)):
         # If the namespace doesn't exist, then it's obviously shared
         return True
-
-    if os.readlink('/proc/%s/ns/%s' % (pid, ns)) == os.readlink('/proc/self/ns/%s' % ns):
-        # Check that the inode for both namespaces is the same
-        return True
+    try:
+        if os.readlink('/proc/%s/ns/%s' % (pid, ns)) == os.readlink('/proc/self/ns/%s' % ns):
+            # Check that the inode for both namespaces is the same
+            return True
+    except OSError as e:
+        if e.errno == errno.ENOENT:
+            return True
+        else:
+            raise
 
     return False
 
diff -Nru apport-2.20.7/debian/changelog apport-2.20.7/debian/changelog
--- apport-2.20.7/debian/changelog	2017-11-27 23:22:40.000000000 +0000
+++ apport-2.20.7/debian/changelog	2017-12-13 18:49:58.000000000 +0000
@@ -1,3 +1,13 @@
+apport (2.20.7-0ubuntu3.7) artful-security; urgency=medium
+
+  * REGRESSION UPDATE: Fix regression that caused a Traceback in the
+    container support (LP: #1733366)
+    - data/apport: add a second os.path.exists check to ensure we do not
+      receive a Traceback in is_container_id() and add an exception handler in
+      case either name space can not be found.
+
+ -- Brian Murray <brian@ubuntu.com>  Wed, 13 Dec 2017 10:49:58 -0800
+
 apport (2.20.7-0ubuntu3.6) artful; urgency=medium
 
   * bin/apport-cli: read until <enter> instead of a single character when # of