diff --git a/ubuntu/Dockerfile b/ubuntu/Dockerfile
index 1c736171..3fd32db7 100644
--- a/ubuntu/Dockerfile
+++ b/ubuntu/Dockerfile
@@ -7,7 +7,7 @@ ENV DEBIAN_FRONTEND=noninteractive
 
 RUN echo "APT::Acquire::Retries=16;" >> /etc/apt/apt.conf.d/99_retries
 RUN apt-get update
-RUN apt-get install -y --fix-missing sudo apt-utils aptitude dirmngr locales
+RUN apt-get install -y --fix-missing sudo apt-utils aptitude dirmngr locales nullmailer
 RUN apt-get -y upgrade
 
 RUN sudo locale-gen en_GB.UTF-8
diff --git a/ubuntu/test_insider b/ubuntu/test_insider
index 9780e69b..fe209e51 100755
--- a/ubuntu/test_insider
+++ b/ubuntu/test_insider
@@ -8,8 +8,12 @@ export NO_SYSTEMCTL=true
 
 echo "APT::Acquire::Retries=16;" >> /etc/apt/apt.conf.d/99_retries
 
+echo "Europe/London" > /etc/timezone
+
 apt-get update
-apt-get install sudo
+apt-get install -y sudo nullmailer tzdata
+dpkg-reconfigure -f noninteractive tzdata
+
 cd $HOME
 
 mkdir -p dev/