diff --git a/runon.conf b/runon.conf
index 00b3ece..c8e1f6c 100644
--- a/runon.conf
+++ b/runon.conf
@@ -45,16 +45,17 @@ packages = xterm vim-X11 git python3 bash-completion
 
 [debian9]
 dockerfile =
-	  FROM debian:9
+    FROM debian:9
     ARG DEBIAN_FRONTEND=noninteractive
+    RUN echo "deb http://archive.debian.org/debian stretch main" > /etc/apt/sources.list
     RUN apt-get update
-    RUN apt-get -y install apt-utils
     RUN apt-get -y upgrade
+    RUN apt install -y --allow-downgrades libnettle6=3.3-1+b2  # default libnettle6 conflicts with libgtk-3.0
     RUN apt-get -y install sudo
     RUN echo "Defaults lecture = never" >> /etc/sudoers
     RUN echo "ALL ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers
 pkginstall = RUN apt-get -y install {}
-packages = ksh csh xterm x11-apps build-essential git libgtk2.0 libgtk-3-0 bash-completion tcl environment-modules
+packages = xterm x11-apps vim-gtk3 git build-essential python3 bash-completion
 
 [debian10]
 dockerfile =