Check for universe enabled in diaspora-install-deps

pkg/ubuntu/diaspora-install-deps

@@ -2,12 +2,19 @@
 #
 # Install diaspora dependencies i. e., what apt-get will do
 #
-set -x
+
+grep -v '^#' /etc/apt/sources.list | grep -q universe || {
+    cat <<- EOF
+	"Warning: it looks like you have not enabled universe in your
+	/etc/apt/sources.list. Most likely, this means trouble.
+	But I will try anyway.
+	EOF
+    sleep 2
+}
 
 sudo apt-get update
 sudo apt-get install -qy build-essential libxslt1-dev libxml2 ruby-full mongodb \
-rake python-software-properties git imagemagick libmagick9-dev
-[starts mongodb]
+     rake python-software-properties git imagemagick libmagick9-dev
 sudo add-apt-repository ppa:maco.m/ruby
 sudo apt-get update
 sudo apt-get install -qy rubygems