Revert #229 (#232)

* libcurl install for mssql

* Revert "updated ubuntu (#229)"

This reverts commit f229883.

docker/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:18.04
+FROM ubuntu:17.10
 
 # https://github.com/phusion/baseimage-docker/issues/58
 ARG DEBIAN_FRONTEND=noninteractive
@@ -21,7 +21,6 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   g++ \
   gfortran \
   git-core \
-  gpg-agent \
   libblas-dev \
   libffi-dev \
   liblapack-dev \
@@ -48,8 +47,9 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 
 # install mssql drivers https://msdn.microsoft.com/en-us/library/hh568454(v=sql.110).aspx
 RUN curl https://packages.microsoft.com/keys/microsoft.asc | apt-key add - \
-  && curl https://packages.microsoft.com/config/ubuntu/18.04/prod.list > /etc/apt/sources.list.d/mssql-release.list
+  && curl https://packages.microsoft.com/config/ubuntu/17.10/prod.list > /etc/apt/sources.list.d/mssql-release.list
 RUN apt-get update && ACCEPT_EULA=Y apt-get install -y --no-install-recommends \
+  libcurl3 \
   msodbcsql17 \
   mssql-tools \
   && rm -rf /var/lib/apt/lists/*