diff --git a/ubuntu/Dockerfile b/ubuntu/Dockerfile
index cb461dbf..ea8e2435 100644
--- a/ubuntu/Dockerfile
+++ b/ubuntu/Dockerfile
@@ -6,6 +6,15 @@ ENV LANGUAGE en_GB.UTF-8
 ENV DEBIAN_FRONTEND=noninteractive
 
 RUN echo "APT::Acquire::Retries=16;" >> /etc/apt/apt.conf.d/99_retries
+RUN echo '\
+deb mirror://mirrors.ubuntu.com/mirrors.txt cosmic main restricted \n\
+deb mirror://mirrors.ubuntu.com/mirrors.txt cosmic-updates main restricted \n\
+deb mirror://mirrors.ubuntu.com/mirrors.txt cosmic-security main restricted \n\
+deb mirror://mirrors.ubuntu.com/mirrors.txt cosmic universe \n\
+deb mirror://mirrors.ubuntu.com/mirrors.txt cosmic-updates universe\n\
+deb mirror://mirrors.ubuntu.com/mirrors.txt cosmic-security universe\n\
+' > /etc/apt/sources.list 
+
 RUN apt-get update
 RUN apt-get install -y --fix-missing sudo apt-utils aptitude dirmngr locales nullmailer
 RUN apt-get -y --fix-missing upgrade