diff --git a/README.md b/README.md
index fbf8e89e..db11f1ba 100644
--- a/README.md
+++ b/README.md
@@ -75,7 +75,7 @@ L'immagine `italia/spid-testenv2` a anche disponibile su [Docker Hub](https://hu
 
    Su macOS si può usare `brew install libxmlsec1 libffi`.
 
-   Su Debian/Ubuntu si può usare `apt-get install libxmlsec1 libffi6`.
+   Su Debian/Ubuntu si può usare `apt-get install libxmlsec1 libffi7`.
 
 1. Creare ed attivare un virtualenv
 
diff --git a/testenv/crypto.py b/testenv/crypto.py
index ad970cf5..5847d62c 100644
--- a/testenv/crypto.py
+++ b/testenv/crypto.py
@@ -290,7 +290,7 @@ def _ensure_matching_certificate(self):
     def _verify_signature(self):
         try:
             self._verifier.verify(
-                self._request.saml_request, x509_cert=self._cert)
+                self._request.saml_request, x509_cert=self._cert, ignore_ambiguous_key_info=True)
         except InvalidDigest:
             self._fail('Il valore del digest non è valido.')
         except InvalidSignature_:
diff --git a/testenv/log.py b/testenv/log.py
index 5eda0a1a..d49b8f04 100644
--- a/testenv/log.py
+++ b/testenv/log.py
@@ -6,7 +6,7 @@
 logging.basicConfig(level=logging.DEBUG)
 
 handler = RotatingFileHandler(
-    'spid.log', maxBytes=500000, backupCount=1
+    '/tmp/spid.log', maxBytes=500000, backupCount=1
 )
 handler.setLevel(logging.DEBUG)
 formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(module)s - %(message)s')