Update Dockerfile to use ubuntu:18.04 image

diff --git a/Dockerfile b/Dockerfile
index 8eed2d628c33484bc4332da3ff0ed564ec20a443..ce5c64fc59766cee6ae27ddcf0f6d5b9c63a0ad0 100644 (file)
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:16.04
+FROM ubuntu:18.04
 
 RUN apt-get -y update && apt-get install -y \
     autoconf \