Update to Ubuntu 18.04

Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:xenial
+FROM ubuntu:18.04
 
 MAINTAINER Robin Smidsrød <robin@smidsrod.no>
 
@@ -7,11 +7,10 @@ ARG DEBIAN_FRONTEND=noninteractive
 RUN apt-get -q -y update \
  && apt-get -q -y -o "DPkg::Options::=--force-confold" -o "DPkg::Options::=--force-confdef" install apt-utils \
  && apt-get -q -y -o "DPkg::Options::=--force-confold" -o "DPkg::Options::=--force-confdef" dist-upgrade \
- && apt-get -q -y -o "DPkg::Options::=--force-confold" -o "DPkg::Options::=--force-confdef" install isc-dhcp-server man \
+ && apt-get -q -y -o "DPkg::Options::=--force-confold" -o "DPkg::Options::=--force-confdef" install dumb-init isc-dhcp-server man \
  && apt-get -q -y autoremove \
  && apt-get -q -y clean \
  && rm -rf /var/lib/apt/lists/*
 
-COPY util/dumb-init_1.2.0_amd64 /usr/bin/dumb-init
 COPY util/entrypoint.sh /entrypoint.sh
 ENTRYPOINT ["/entrypoint.sh"]

Dockerfile.arm32v7

@@ -1,4 +1,4 @@
-FROM ubuntu:xenial
+FROM ubuntu:18.04
 
 MAINTAINER Simon Holzmayer <simon@holzmayer.me>
 
@@ -7,11 +7,10 @@ ARG DEBIAN_FRONTEND=noninteractive
 RUN apt-get -q -y update \
  && apt-get -q -y -o "DPkg::Options::=--force-confold" -o "DPkg::Options::=--force-confdef" install apt-utils \
  && apt-get -q -y -o "DPkg::Options::=--force-confold" -o "DPkg::Options::=--force-confdef" dist-upgrade \
- && apt-get -q -y -o "DPkg::Options::=--force-confold" -o "DPkg::Options::=--force-confdef" install isc-dhcp-server man \
+ && apt-get -q -y -o "DPkg::Options::=--force-confold" -o "DPkg::Options::=--force-confdef" install dumb-init isc-dhcp-server man \
  && apt-get -q -y autoremove \
  && apt-get -q -y clean \
  && rm -rf /var/lib/apt/lists/*
 
-COPY util/dumb-init_1.2.0_armhf /usr/bin/dumb-init
 COPY util/entrypoint.sh /entrypoint.sh
 ENTRYPOINT ["/entrypoint.sh"]