The Docker builds seem to be broken now. After deleting the existing docker
images, I get the following error when `docker.build.sh` tries to rebuild the
images:
```
...
Updating certificates in /etc/ssl/certs... 0 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d....done.
Processing triggers for ureadahead (0.100.0-16) ...
Errors were encountered while processing:
/var/cache/apt/archives/aspnetcore-runtime-2.2_2.2.1-1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
The command '/bin/sh -c apt-get update && apt-get -y install
software-properties-common python-software-properties apt-transport-https curl
&& echo oracle-java8-installer shared/accepted-oracle-license-v1-1 select
true | debconf-set-selections && add-apt-repository -y ppa:webupd8team/java
&& sh -c 'curl -s
https://packages.microsoft.com/config/ubuntu/14.04/packages-microsoft-prod.deb
-o packages-microsoft-prod.deb' && sh -c 'dpkg -i
packages-microsoft-prod.deb' && sh -c 'echo "deb
https://download.mono-project.com/repo/ubuntu stable-trusty main" | sudo tee
/etc/apt/sources.list.d/mono-official-stable.list' && apt-key adv
--keyserver hkp://keyserver.ubuntu.com:80 --recv-keys
3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF && apt-get update && apt-get
install -y oracle-java8-installer gawk git maven openssh-server subversion zip
&& apt-get install -y --force-yes dotnet-sdk-2.2 python python-dev
python3-dev python-pip build-essential mono-devel && pi
p install virtualenv virtualenvwrapper && pip install --upgrade pip &&
rm -rf /var/lib/apt/lists/* /var/cache/oracle-jdk8-installer' returned a
non-zero code: 100
```
[ Full content available at: https://github.com/apache/tinkerpop/pull/1026 ]
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