Upgrade Docker Base Image from Ubuntu 17.10 to 18.04

[huan]

See: fe37ea7

[storenth]

Verified with Docker build

`Sending build context to Docker daemon  232.6MB

Step 1/13 : FROM ubuntu:18.10
 ---> 9dc19675e327
Step 2/13 : RUN apt-get update && apt-get install -y     locales     apt-utils     gnupg gnupg2 gnupg1     gconf-service    libasound2     libatk1.0-0     libatk-bridge2.0-0     libc6 libcairo2     libcups2     libdbus-1-3     libexpat1     libfontconfig1     libgcc1     libgconf-2-4     libgdk-pixbuf2.0-0     libglib2.0-0     libgtk-3-0     libnspr4      libpangocairo-1.0-0 libstdc++6 libx11-6 libx11-xcb1 libxcb1 libxcomposite1 libxcursor1 libxdamage1 libxext6 libxfixes3 libxi6 libxrandr2 libxrender1 libxss1 libxtst6 ca-certificates fonts-liberation libappindicator1 libnss3 lsb-release xdg-utils wget     && rm -rf /var/lib/apt/lists/*
 ---> Using cache
 ---> 8402d354cfd0
Step 3/13 : ENV APT_KEY_DONT_WARN_ON_DANGEROUS_USAGE=DontWarn
 ---> Using cache
 ---> a051342acd5d
Step 4/13 : RUN wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -     && sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list'     && apt-get update && apt-get install -y google-chrome-unstable fonts-ipafont-gothic fonts-wqy-zenhei fonts-thai-tlwg fonts-kacst ttf-freefont     --no-install-recommends     && rm -rf /var/lib/apt/lists/*
 ---> Running in 4c771db2a9a6
OK
Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease
Get:2 http://dl.google.com/linux/chrome/deb stable Release [943 B]
Get:3 http://dl.google.com/linux/chrome/deb stable Release.gpg [819 B]
Get:4 http://archive.ubuntu.com/ubuntu cosmic InRelease [242 kB]
Get:5 http://security.ubuntu.com/ubuntu cosmic-security InRelease [88.7 kB]
Get:6 http://dl.google.com/linux/chrome/deb stable/main amd64 Packages [1114 B]
Get:7 http://archive.ubuntu.com/ubuntu cosmic-updates InRelease [88.7 kB]
Get:8 http://archive.ubuntu.com/ubuntu cosmic-backports InRelease [74.6 kB]
Get:9 http://archive.ubuntu.com/ubuntu cosmic/multiverse amd64 Packages [195 kB]
Get:10 http://archive.ubuntu.com/ubuntu cosmic/universe amd64 Packages [11.6 MB]
Get:11 http://security.ubuntu.com/ubuntu cosmic-security/universe amd64 Packages [633 kB]
Get:12 http://security.ubuntu.com/ubuntu cosmic-security/multiverse amd64 Packages [3916 B]
Get:13 http://security.ubuntu.com/ubuntu cosmic-security/main amd64 Packages [267 kB]
Get:14 http://security.ubuntu.com/ubuntu cosmic-security/restricted amd64 Packages [5433 B]
Get:15 http://archive.ubuntu.com/ubuntu cosmic/main amd64 Packages [1342 kB]
Get:16 http://archive.ubuntu.com/ubuntu cosmic/restricted amd64 Packages [13.6 kB]
Get:17 http://archive.ubuntu.com/ubuntu cosmic-updates/restricted amd64 Packages [5433 B]
Get:18 http://archive.ubuntu.com/ubuntu cosmic-updates/main amd64 Packages [447 kB]
Get:19 http://archive.ubuntu.com/ubuntu cosmic-updates/universe amd64 Packages [888 kB]
Get:20 http://archive.ubuntu.com/ubuntu cosmic-updates/multiverse amd64 Packages [3916 B]
Get:21 http://archive.ubuntu.com/ubuntu cosmic-backports/universe amd64 Packages [4321 B]
Get:22 http://archive.ubuntu.com/ubuntu cosmic-backports/main amd64 Packages [1669 B]
Fetched 16.0 MB in 7s (2330 kB/s)
Reading package lists...
Reading package lists...
Building dependency tree...
Reading state information...
Package ttf-freefont is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'ttf-freefont' has no installation candidate
returned a non-zero code: 100
`