Its python-libpcap, not python-pcapy.
diff --git a/ansible/roles/common/defaults/main.yml b/ansible/roles/common/defaults/main.yml
index 4a6905e..5ed426f 100644
--- a/ansible/roles/common/defaults/main.yml
+++ b/ansible/roles/common/defaults/main.yml
@@ -13,7 +13,7 @@
   - python-nose
   - python-flake8
   - python-scapy
-  - python-pcapy
+  - python-libpcap
 
 obsolete_services:
   - puppet