From 10b8bdc894d6628a57c178d83c321e1ef3a2c5dd Mon Sep 17 00:00:00 2001
From: Michael Stucki <michael.stucki@typo3.org>
Date: Sat, 8 Mar 2014 18:41:03 +0100
Subject: [PATCH] Fix sources.list (add universe) for Ubuntu images

---
 Dockerfile | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index 82639c0..62bedb0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,10 +5,9 @@
 FROM ubuntu:12.04
 MAINTAINER Michael Stucki <mundaun@gmx.ch>
 
-# Newer images of ubuntu:12.04 already contain this entry, and if the line appears twice in the file, apt would throw a warning.
-RUN grep -q "universe" /etc/apt/sources.list || echo "deb http://archive.ubuntu.com/ubuntu precise universe" >> /etc/apt/sources.list
-
 ENV DEBIAN_FRONTEND noninteractive
+
+RUN sed -i 's/main$/main universe/' /etc/apt/sources.list
 RUN apt-get -qq update
 RUN apt-get install -y python-software-properties bsdmainutils curl file screen