title: CVAT installation issue
body: <p>I'm trying to install CVAT and I'm following this installation guide:
  <a href="https://github.com/opencv/cvat/blob/develop/cvat/apps/documentation/installation.md#windows-10" rel="nofollow noreferrer">https://github.com/opencv/cvat/blob/develop/cvat/apps/documentation/installation.md#windows-10</a></p>
  
  <p>I installed Docker and Git as mentioned in the guide.
  Cloned the CVAT source code from GitHub repository.</p>
  
  <p>After this, I tried building docker images as mentioned in the guide.</p>
  
  <p>$ cd cvat
  $ docker-compose build</p>
  
  <p>The complete Output:</p>
  
  <pre><code>cvat_db uses an image, skipping
  cvat_redis uses an image, skipping
  Building cvat
  Step 1/49 : FROM ubuntu:16.04
   ---&gt; 657d80a6401d
  Step 2/49 : ARG http_proxy
   ---&gt; Using cache
   ---&gt; ea9c09815fdf
  Step 3/49 : ARG https_proxy
   ---&gt; Using cache
   ---&gt; f89f44a5f8df
  Step 4/49 : ARG no_proxy
   ---&gt; Using cache
   ---&gt; 1b880afdbe43
  Step 5/49 : ARG socks_proxy
   ---&gt; Using cache
   ---&gt; 363c0a550b77
  Step 6/49 : ARG TZ
   ---&gt; Using cache
   ---&gt; bef9ff0b2b9d
  Step 7/49 : ENV TERM=xterm     http_proxy=${http_proxy}       https_proxy=${https_proxy}     no_proxy=${no_proxy}     socks_proxy=${socks_proxy}     LANG='C.UTF-8'      LC_ALL='C.UTF-8'     TZ=${TZ}
   ---&gt; Using cache
   ---&gt; 688cc1462f94
  Step 8/49 : ARG USER
   ---&gt; Using cache
   ---&gt; 33042ece9638
  Step 9/49 : ARG DJANGO_CONFIGURATION
   ---&gt; Using cache
   ---&gt; 176f7ed3f807
  Step 10/49 : ENV DJANGO_CONFIGURATION=${DJANGO_CONFIGURATION}
   ---&gt; Using cache
   ---&gt; 6f6922b72aea
  Step 11/49 : RUN apt-get update &amp;&amp;     apt-transport-https     apt-get install -yq         python-software-properties         software-properties-common         wget &amp;&amp;     add-apt-repository ppa:mc3man/xerus-media -y &amp;&amp;     add-apt-repository ppa:mc3man/gstffmpeg-keep -y &amp;&amp;     apt-get update &amp;&amp;     DEBIAN_FRONTEND=noninteractive apt-get install -yq         apache2         apache2-dev         libapache2-mod-xsendfile         supervisor         ffmpeg         gstreamer0.10-ffmpeg         libldap2-dev         libsasl2-dev         python3-dev         python3-pip         tzdata         unzip         unrar         p7zip-full         vim &amp;&amp;     pip3 install -U setuptools &amp;&amp;     ln -fs /usr/share/zoneinfo/${TZ} /etc/localtime &amp;&amp;     dpkg-reconfigure -f noninteractive tzdata &amp;&amp;     add-apt-repository --remove ppa:mc3man/gstffmpeg-keep -y &amp;&amp;     add-apt-repository --remove ppa:mc3man/xerus-media -y &amp;&amp;     rm -rf /var/lib/apt/lists/*
   ---&gt; Running in f84af309de6a
  Ign:1 http://security.ubuntu.com/ubuntu xenial-security InRelease
  Ign:2 http://archive.ubuntu.com/ubuntu xenial InRelease
  Ign:3 http://security.ubuntu.com/ubuntu xenial-security Release
  Ign:4 http://archive.ubuntu.com/ubuntu xenial-updates InRelease
  Ign:5 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
  Ign:6 http://archive.ubuntu.com/ubuntu xenial-backports InRelease
  Ign:7 http://archive.ubuntu.com/ubuntu xenial Release
  Ign:8 http://security.ubuntu.com/ubuntu xenial-security/main all Packages
  Ign:9 http://archive.ubuntu.com/ubuntu xenial-updates Release
  Ign:10 http://security.ubuntu.com/ubuntu xenial-security/restricted amd64 Packages
  Ign:11 http://archive.ubuntu.com/ubuntu xenial-backports Release
  Ign:12 http://security.ubuntu.com/ubuntu xenial-security/restricted all Packages
  Ign:13 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
  Ign:14 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 Packages
  Ign:15 http://archive.ubuntu.com/ubuntu xenial/main all Packages
  Ign:16 http://security.ubuntu.com/ubuntu xenial-security/universe all Packages
  Ign:17 http://archive.ubuntu.com/ubuntu xenial/restricted amd64 Packages
  Ign:18 http://security.ubuntu.com/ubuntu xenial-security/multiverse amd64 Packages
  Ign:19 http://archive.ubuntu.com/ubuntu xenial/restricted all Packages
  Ign:20 http://security.ubuntu.com/ubuntu xenial-security/multiverse all Packages
  Ign:21 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
  Ign:5 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
  Ign:8 http://security.ubuntu.com/ubuntu xenial-security/main all Packages
  Ign:10 http://security.ubuntu.com/ubuntu xenial-security/restricted amd64 Packages
  Ign:12 http://security.ubuntu.com/ubuntu xenial-security/restricted all Packages
  Ign:22 http://archive.ubuntu.com/ubuntu xenial/universe all Packages
  Ign:14 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 Packages
  Ign:23 http://archive.ubuntu.com/ubuntu xenial/multiverse amd64 Packages
  Ign:24 http://archive.ubuntu.com/ubuntu xenial/multiverse all Packages
  Ign:25 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
  Ign:26 http://archive.ubuntu.com/ubuntu xenial-updates/main all Packages
  Ign:27 http://archive.ubuntu.com/ubuntu xenial-updates/restricted amd64 Packages
  Ign:16 http://security.ubuntu.com/ubuntu xenial-security/universe all Packages
  Ign:28 http://archive.ubuntu.com/ubuntu xenial-updates/restricted all Packages
  Ign:18 http://security.ubuntu.com/ubuntu xenial-security/multiverse amd64 Packages
  Ign:29 http://archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages
  Ign:20 http://security.ubuntu.com/ubuntu xenial-security/multiverse all Packages
  Ign:30 http://archive.ubuntu.com/ubuntu xenial-updates/universe all Packages
  Ign:5 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
  Ign:31 http://archive.ubuntu.com/ubuntu xenial-updates/multiverse amd64 Packages
  Ign:8 http://security.ubuntu.com/ubuntu xenial-security/main all Packages
  Ign:32 http://archive.ubuntu.com/ubuntu xenial-updates/multiverse all Packages
  Ign:33 http://archive.ubuntu.com/ubuntu xenial-backports/main amd64 Packages
  Ign:10 http://security.ubuntu.com/ubuntu xenial-security/restricted amd64 Packages
  Ign:34 http://archive.ubuntu.com/ubuntu xenial-backports/main all Packages
  Ign:12 http://security.ubuntu.com/ubuntu xenial-security/restricted all Packages
  Ign:35 http://archive.ubuntu.com/ubuntu xenial-backports/restricted amd64 Packages
  Ign:14 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 Packages
  Ign:36 http://archive.ubuntu.com/ubuntu xenial-backports/restricted all Packages
  Ign:16 http://security.ubuntu.com/ubuntu xenial-security/universe all Packages
  Ign:37 http://archive.ubuntu.com/ubuntu xenial-backports/universe amd64 Packages
  Ign:18 http://security.ubuntu.com/ubuntu xenial-security/multiverse amd64 Packages
  Ign:38 http://archive.ubuntu.com/ubuntu xenial-backports/universe all Packages
  Ign:20 http://security.ubuntu.com/ubuntu xenial-security/multiverse all Packages
  Ign:39 http://archive.ubuntu.com/ubuntu xenial-backports/multiverse amd64 Packages
  Ign:5 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
  Ign:40 http://archive.ubuntu.com/ubuntu xenial-backports/multiverse all Packages
  Ign:13 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
  Ign:8 http://security.ubuntu.com/ubuntu xenial-security/main all Packages
  Ign:10 http://security.ubuntu.com/ubuntu xenial-security/restricted amd64 Packages
  Ign:15 http://archive.ubuntu.com/ubuntu xenial/main all Packages
  Ign:12 http://security.ubuntu.com/ubuntu xenial-security/restricted all Packages
  Ign:17 http://archive.ubuntu.com/ubuntu xenial/restricted amd64 Packages
  Ign:14 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 Packages
  Ign:19 http://archive.ubuntu.com/ubuntu xenial/restricted all Packages
  Ign:16 http://security.ubuntu.com/ubuntu xenial-security/universe all Packages
  Ign:21 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
  Ign:18 http://security.ubuntu.com/ubuntu xenial-security/multiverse amd64 Packages
  Ign:22 http://archive.ubuntu.com/ubuntu xenial/universe all Packages
  Ign:20 http://security.ubuntu.com/ubuntu xenial-security/multiverse all Packages
  Ign:5 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
  Ign:23 http://archive.ubuntu.com/ubuntu xenial/multiverse amd64 Packages
  Ign:8 http://security.ubuntu.com/ubuntu xenial-security/main all Packages
  Ign:24 http://archive.ubuntu.com/ubuntu xenial/multiverse all Packages
  Ign:10 http://security.ubuntu.com/ubuntu xenial-security/restricted amd64 Packages
  Ign:25 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
  Ign:12 http://security.ubuntu.com/ubuntu xenial-security/restricted all Packages
  Ign:26 http://archive.ubuntu.com/ubuntu xenial-updates/main all Packages
  Ign:14 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 Packages
  Ign:27 http://archive.ubuntu.com/ubuntu xenial-updates/restricted amd64 Packages
  Ign:28 http://archive.ubuntu.com/ubuntu xenial-updates/restricted all Packages
  Ign:16 http://security.ubuntu.com/ubuntu xenial-security/universe all Packages
  Ign:18 http://security.ubuntu.com/ubuntu xenial-security/multiverse amd64 Packages
  Ign:29 http://archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages
  Ign:30 http://archive.ubuntu.com/ubuntu xenial-updates/universe all Packages
  Ign:20 http://security.ubuntu.com/ubuntu xenial-security/multiverse all Packages
  Ign:31 http://archive.ubuntu.com/ubuntu xenial-updates/multiverse amd64 Packages
  Err:5 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
    500  Internal Server Error [IP: 159.69.208.88 11371]
  Ign:32 http://archive.ubuntu.com/ubuntu xenial-updates/multiverse all Packages
  Ign:8 http://security.ubuntu.com/ubuntu xenial-security/main all Packages
  Ign:33 http://archive.ubuntu.com/ubuntu xenial-backports/main amd64 Packages
  Ign:10 http://security.ubuntu.com/ubuntu xenial-security/restricted amd64 Packages
  Ign:34 http://archive.ubuntu.com/ubuntu xenial-backports/main all Packages
  Ign:12 http://security.ubuntu.com/ubuntu xenial-security/restricted all Packages
  Ign:35 http://archive.ubuntu.com/ubuntu xenial-backports/restricted amd64 Packages
  Ign:14 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 Packages
  Ign:36 http://archive.ubuntu.com/ubuntu xenial-backports/restricted all Packages
  Ign:16 http://security.ubuntu.com/ubuntu xenial-security/universe all Packages
  Ign:37 http://archive.ubuntu.com/ubuntu xenial-backports/universe amd64 Packages
  Ign:18 http://security.ubuntu.com/ubuntu xenial-security/multiverse amd64 Packages
  Ign:38 http://archive.ubuntu.com/ubuntu xenial-backports/universe all Packages
  Ign:20 http://security.ubuntu.com/ubuntu xenial-security/multiverse all Packages
  Ign:39 http://archive.ubuntu.com/ubuntu xenial-backports/multiverse amd64 Packages
  Ign:40 http://archive.ubuntu.com/ubuntu xenial-backports/multiverse all Packages
  Ign:13 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
  Ign:15 http://archive.ubuntu.com/ubuntu xenial/main all Packages
  Ign:17 http://archive.ubuntu.com/ubuntu xenial/restricted amd64 Packages
  Ign:19 http://archive.ubuntu.com/ubuntu xenial/restricted all Packages
  Ign:21 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
  Ign:22 http://archive.ubuntu.com/ubuntu xenial/universe all Packages
  Ign:23 http://archive.ubuntu.com/ubuntu xenial/multiverse amd64 Packages
  Ign:24 http://archive.ubuntu.com/ubuntu xenial/multiverse all Packages
  Ign:25 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
  Ign:26 http://archive.ubuntu.com/ubuntu xenial-updates/main all Packages
  Ign:27 http://archive.ubuntu.com/ubuntu xenial-updates/restricted amd64 Packages
  Ign:28 http://archive.ubuntu.com/ubuntu xenial-updates/restricted all Packages
  Ign:29 http://archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages
  Ign:30 http://archive.ubuntu.com/ubuntu xenial-updates/universe all Packages
  Ign:31 http://archive.ubuntu.com/ubuntu xenial-updates/multiverse amd64 Packages
  Ign:32 http://archive.ubuntu.com/ubuntu xenial-updates/multiverse all Packages
  Ign:33 http://archive.ubuntu.com/ubuntu xenial-backports/main amd64 Packages
  Ign:34 http://archive.ubuntu.com/ubuntu xenial-backports/main all Packages
  Ign:35 http://archive.ubuntu.com/ubuntu xenial-backports/restricted amd64 Packages
  Ign:36 http://archive.ubuntu.com/ubuntu xenial-backports/restricted all Packages
  Ign:37 http://archive.ubuntu.com/ubuntu xenial-backports/universe amd64 Packages
  Ign:38 http://archive.ubuntu.com/ubuntu xenial-backports/universe all Packages
  Ign:39 http://archive.ubuntu.com/ubuntu xenial-backports/multiverse amd64 Packages
  Ign:40 http://archive.ubuntu.com/ubuntu xenial-backports/multiverse all Packages
  Ign:13 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
  Ign:15 http://archive.ubuntu.com/ubuntu xenial/main all Packages
  Ign:17 http://archive.ubuntu.com/ubuntu xenial/restricted amd64 Packages
  Ign:19 http://archive.ubuntu.com/ubuntu xenial/restricted all Packages
  Ign:21 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
  Ign:22 http://archive.ubuntu.com/ubuntu xenial/universe all Packages
  Ign:23 http://archive.ubuntu.com/ubuntu xenial/multiverse amd64 Packages
  Ign:24 http://archive.ubuntu.com/ubuntu xenial/multiverse all Packages
  Ign:25 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
  Ign:26 http://archive.ubuntu.com/ubuntu xenial-updates/main all Packages
  Ign:27 http://archive.ubuntu.com/ubuntu xenial-updates/restricted amd64 Packages
  Ign:28 http://archive.ubuntu.com/ubuntu xenial-updates/restricted all Packages
  Ign:29 http://archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages
  Ign:30 http://archive.ubuntu.com/ubuntu xenial-updates/universe all Packages
  Ign:31 http://archive.ubuntu.com/ubuntu xenial-updates/multiverse amd64 Packages
  Ign:32 http://archive.ubuntu.com/ubuntu xenial-updates/multiverse all Packages
  Ign:33 http://archive.ubuntu.com/ubuntu xenial-backports/main amd64 Packages
  Ign:34 http://archive.ubuntu.com/ubuntu xenial-backports/main all Packages
  Ign:35 http://archive.ubuntu.com/ubuntu xenial-backports/restricted amd64 Packages
  Ign:36 http://archive.ubuntu.com/ubuntu xenial-backports/restricted all Packages
  Ign:37 http://archive.ubuntu.com/ubuntu xenial-backports/universe amd64 Packages
  Ign:38 http://archive.ubuntu.com/ubuntu xenial-backports/universe all Packages
  Ign:39 http://archive.ubuntu.com/ubuntu xenial-backports/multiverse amd64 Packages
  Ign:40 http://archive.ubuntu.com/ubuntu xenial-backports/multiverse all Packages
  Ign:13 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
  Ign:15 http://archive.ubuntu.com/ubuntu xenial/main all Packages
  Ign:17 http://archive.ubuntu.com/ubuntu xenial/restricted amd64 Packages
  Ign:19 http://archive.ubuntu.com/ubuntu xenial/restricted all Packages
  Ign:21 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
  Ign:22 http://archive.ubuntu.com/ubuntu xenial/universe all Packages
  Ign:23 http://archive.ubuntu.com/ubuntu xenial/multiverse amd64 Packages
  Ign:24 http://archive.ubuntu.com/ubuntu xenial/multiverse all Packages
  Ign:25 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
  Ign:26 http://archive.ubuntu.com/ubuntu xenial-updates/main all Packages
  Ign:27 http://archive.ubuntu.com/ubuntu xenial-updates/restricted amd64 Packages
  Ign:28 http://archive.ubuntu.com/ubuntu xenial-updates/restricted all Packages
  Ign:29 http://archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages
  Ign:30 http://archive.ubuntu.com/ubuntu xenial-updates/universe all Packages
  Ign:31 http://archive.ubuntu.com/ubuntu xenial-updates/multiverse amd64 Packages
  Ign:32 http://archive.ubuntu.com/ubuntu xenial-updates/multiverse all Packages
  Ign:33 http://archive.ubuntu.com/ubuntu xenial-backports/main amd64 Packages
  Ign:34 http://archive.ubuntu.com/ubuntu xenial-backports/main all Packages
  Ign:35 http://archive.ubuntu.com/ubuntu xenial-backports/restricted amd64 Packages
  Ign:36 http://archive.ubuntu.com/ubuntu xenial-backports/restricted all Packages
  Ign:37 http://archive.ubuntu.com/ubuntu xenial-backports/universe amd64 Packages
  Ign:38 http://archive.ubuntu.com/ubuntu xenial-backports/universe all Packages
  Ign:39 http://archive.ubuntu.com/ubuntu xenial-backports/multiverse amd64 Packages
  Ign:40 http://archive.ubuntu.com/ubuntu xenial-backports/multiverse all Packages
  Err:13 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
    500  Internal Server Error [IP: 159.69.208.88 11371]
  Ign:15 http://archive.ubuntu.com/ubuntu xenial/main all Packages
  Ign:17 http://archive.ubuntu.com/ubuntu xenial/restricted amd64 Packages
  Ign:19 http://archive.ubuntu.com/ubuntu xenial/restricted all Packages
  Ign:21 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
  Ign:22 http://archive.ubuntu.com/ubuntu xenial/universe all Packages
  Ign:23 http://archive.ubuntu.com/ubuntu xenial/multiverse amd64 Packages
  Ign:24 http://archive.ubuntu.com/ubuntu xenial/multiverse all Packages
  Err:25 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
    500  Internal Server Error [IP: 159.69.208.88 11371]
  Ign:26 http://archive.ubuntu.com/ubuntu xenial-updates/main all Packages
  Ign:27 http://archive.ubuntu.com/ubuntu xenial-updates/restricted amd64 Packages
  Ign:28 http://archive.ubuntu.com/ubuntu xenial-updates/restricted all Packages
  Ign:29 http://archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages
  Ign:30 http://archive.ubuntu.com/ubuntu xenial-updates/universe all Packages
  Ign:31 http://archive.ubuntu.com/ubuntu xenial-updates/multiverse amd64 Packages
  Ign:32 http://archive.ubuntu.com/ubuntu xenial-updates/multiverse all Packages
  Err:33 http://archive.ubuntu.com/ubuntu xenial-backports/main amd64 Packages
    500  Internal Server Error [IP: 159.69.208.88 11371]
  Ign:34 http://archive.ubuntu.com/ubuntu xenial-backports/main all Packages
  Ign:35 http://archive.ubuntu.com/ubuntu xenial-backports/restricted amd64 Packages
  Ign:36 http://archive.ubuntu.com/ubuntu xenial-backports/restricted all Packages
  Ign:37 http://archive.ubuntu.com/ubuntu xenial-backports/universe amd64 Packages
  Ign:38 http://archive.ubuntu.com/ubuntu xenial-backports/universe all Packages
  Ign:39 http://archive.ubuntu.com/ubuntu xenial-backports/multiverse amd64 Packages
  Ign:40 http://archive.ubuntu.com/ubuntu xenial-backports/multiverse all Packages
  Reading package lists...
  W: The repository 'http://security.ubuntu.com/ubuntu xenial-security Release' does not have a Release file.
  W: The repository 'http://archive.ubuntu.com/ubuntu xenial Release' does not have a Release file.
  W: The repository 'http://archive.ubuntu.com/ubuntu xenial-updates Release' does not have a Release file.
  W: The repository 'http://archive.ubuntu.com/ubuntu xenial-backports Release' does not have a Release file.
  E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/main/binary-amd64/Packages  500  Internal Server Error [IP: 159.69.208.88 11371]
  E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial/main/binary-amd64/Packages  500  Internal Server Error [IP: 159.69.208.88 11371]
  E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-updates/main/binary-amd64/Packages  500  Internal Server Error [IP: 159.69.208.88 11371]
  E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-backports/main/binary-amd64/Packages  500  Internal Server Error [IP: 159.69.208.88 11371]
  E: Some index files failed to download. They have been ignored, or old ones used instead.
  Service 'cvat' failed to build: The command '/bin/sh -c apt-get update &amp;&amp;     apt-transport-https     apt-get install -yq         python-software-properties         software-properties-common         wget &amp;&amp;     add-apt-repository ppa:mc3man/xerus-media -y &amp;&amp;     add-apt-repository ppa:mc3man/gstffmpeg-keep -y &amp;&amp;     apt-get update &amp;&amp;     DEBIAN_FRONTEND=noninteractive apt-get install -yq         apache2         apache2-dev         libapache2-mod-xsendfile         supervisor         ffmpeg         gstreamer0.10-ffmpeg         libldap2-dev         libsasl2-dev         python3-dev         python3-pip         tzdata         unzip         unrar         p7zip-full         vim &amp;&amp;     pip3 install -U setuptools &amp;&amp;     ln -fs /usr/share/zoneinfo/${TZ} /etc/localtime &amp;&amp;     dpkg-reconfigure -f noninteractive tzdata &amp;&amp;     add-apt-repository --remove ppa:mc3man/gstffmpeg-keep -y &amp;&amp;     add-apt-repository --remove ppa:mc3man/xerus-media -y &amp;&amp;     rm -rf /var/lib/apt/lists/*' returned a non-zero code: 100
  </code></pre>
  
  <p>Errors:</p>
  
  <pre><code>E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/main/binary-amd64/Packages  500  Internal Server Error [IP: 159.69.208.88 11371]
  E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial/main/binary-amd64/Packages  500  Internal Server Error [IP: 159.69.208.88 11371]
  E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-updates/main/binary-amd64/Packages  500  Internal Server Error [IP: 159.69.208.88 11371]
  E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-backports/main/binary-amd64/Packages  500  Internal Server Error [IP: 159.69.208.88 11371]
  E: Some index files failed to download. They have been ignored, or old ones used instead.
  Service 'cvat' failed to build: The command '/bin/sh -c apt-get update &amp;&amp;     apt-transport-https     apt-get install -yq         python-software-properties         software-properties-common         wget &amp;&amp;     add-apt-repository ppa:mc3man/xerus-media -y &amp;&amp;     add-apt-repository ppa:mc3man/gstffmpeg-keep -y &amp;&amp;     apt-get update &amp;&amp;     DEBIAN_FRONTEND=noninteractive apt-get install -yq         apache2         apache2-dev         libapache2-mod-xsendfile         supervisor         ffmpeg         gstreamer0.10-ffmpeg         libldap2-dev         libsasl2-dev         python3-dev         python3-pip         tzdata         unzip         unrar         p7zip-full         vim &amp;&amp;     pip3 install -U setuptools &amp;&amp;     ln -fs /usr/share/zoneinfo/${TZ} /etc/localtime &amp;&amp;     dpkg-reconfigure -f noninteractive tzdata &amp;&amp;     add-apt-repository --remove ppa:mc3man/gstffmpeg-keep -y &amp;&amp;     add-apt-repository --remove ppa:mc3man/xerus-media -y &amp;&amp;     rm -rf /var/lib/apt/lists/*' returned a non-zero code: 100
  </code></pre>