nginx repo url update

install/vst-install-ubuntu.sh

@@ -403,7 +403,7 @@ check_result $? 'apt-get upgrade failed'
 
 # Installing nginx repo
 apt=/etc/apt/sources.list.d
-echo "deb http://nginx.org/packages/debian/ $codename nginx" > $apt/nginx.list
+echo "deb http://nginx.org/packages/ubuntu/ $codename nginx" > $apt/nginx.list
 wget http://nginx.org/keys/nginx_signing.key -O /tmp/nginx_signing.key
 apt-key add /tmp/nginx_signing.key