/var/apt/cache is in reality /var/cache/apt

debian/apt.cron.daily

@@ -8,7 +8,7 @@
 #  Dir "/";
 #  - RootDir for all configuration files
 #
-#  Dir::Cache "var/apt/cache/";
+#  Dir::Cache "var/cache/apt/";
 #  - Set apt package cache directory
 #
 #  Dir::Cache::Archives "archives/";