--- a/check-in-docker.sh	Wed May 30 20:46:17 2018 +0800
+++ b/check-in-docker.sh	Thu May 31 12:18:06 2018 +0800
@@ -2,7 +2,7 @@
 set -eu
 
 (
-    cat dockerfiles/ubuntu-xenial
+    cat dockerfiles/ubuntu-bionic
     echo 'WORKDIR /mnt'
 ) | docker build --tag candolint-checker - 1>&2
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dockerfiles/ubuntu-bionic	Thu May 31 12:18:06 2018 +0800
@@ -0,0 +1,20 @@
+FROM ubuntu:xenial
+
+ENV LC_ALL C.UTF-8
+
+RUN echo 'APT::Install-Recommends "no";' > /etc/apt/apt.conf.d/99recommends
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+    python2.7 \
+    python3 \
+    build-essential \
+    git \
+    mercurial \
+    python-yaml \
+    luarocks \
+    unzip \
+    npm \
+    virtualenv \
+    shellcheck \
+ && rm -rf /var/lib/apt/lists/*
+
+RUN useradd worker --create-home --user-group

--- a/dockerfiles/ubuntu-xenial	Wed May 30 20:46:17 2018 +0800
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,20 +0,0 @@
-FROM ubuntu:xenial
-
-ENV LC_ALL C.UTF-8
-
-RUN echo 'APT::Install-Recommends "no";' > /etc/apt/apt.conf.d/99recommends
-RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
-    python2.7 \
-    python3 \
-    build-essential \
-    git \
-    mercurial \
-    python-yaml \
-    luarocks \
-    unzip \
-    npm \
-    virtualenv \
-    shellcheck \
- && rm -rf /var/lib/apt/lists/*
-
-RUN useradd worker --create-home --user-group