diff --git a/Dockerfiles/forContainerNet/err.txt b/Dockerfiles/forContainerNet/err.txt
new file mode 100644
index 0000000..d528e96
--- /dev/null
+++ b/Dockerfiles/forContainerNet/err.txt
@@ -0,0 +1 @@
+debconf: delaying package configuration, since apt-utils is not installed