Remove usergroup because debian adds it by default as the primary group

roles/common/tasks/users.yml

@@ -1,2 +1,2 @@
 - name: Create main user account
-  user: name=${main_user_name} state=present shell=/usr/bin/zsh groups=${main_user_name},sudo,fuse
+  user: name=${main_user_name} state=present shell=/usr/bin/zsh groups=sudo,fuse