title: debconf: delaying package configuration, since apt-utils is not installed
body: <p>I'm setting up <strong>Docker</strong> to run my <strong>CakePHP</strong> application and my <strong>Dockerfile</strong> is like</p>
  
  <pre><code>FROM php:7.2-apache
  
  # Enable Apache Rewrite + Expires Module
  RUN a2enmod rewrite expires
  
  # Install dependencies
  RUN apt-get update &amp;&amp; apt-get install -y \
      unzip \
      libfreetype6-dev \
      libjpeg62-turbo-dev \
      libpng-dev \
      libyaml-dev \
      zlib1g-dev \
      libicu-dev \
      g++ \
      git \
      libzip-dev \
      zip \
      &amp;&amp; docker-php-ext-install opcache \
      &amp;&amp; docker-php-ext-configure intl \
      &amp;&amp; docker-php-ext-install intl \
      &amp;&amp; docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/ \
      &amp;&amp; docker-php-ext-configure zip --with-libzip \
      &amp;&amp; docker-php-ext-install zip \
      &amp;&amp; docker-php-ext-install -j$(nproc) gd \
      &amp;&amp; docker-php-ext-install zip
  </code></pre>
  
  <p>But when I run </p>
  
  <pre><code>docker-composer build
  </code></pre>
  
  <p>It gives me an error like</p>
  
  <pre><code>debconf: delaying package configuration, since apt-utils is not installed
  </code></pre>
  
  <p>The log is like</p>
  
  <pre><code>After this operation, 1607 kB of additional disk space will be used.
  Get:1 http://cdn-fastly.deb.debian.org/debian stretch/main amd64 libapt-inst2.0 amd64 1.4.8 [192 kB]
  Get:2 http://cdn-fastly.deb.debian.org/debian stretch/main amd64 apt-utils amd64 1.4.8 [410 kB]
  debconf: delaying package configuration, since apt-utils is not installed
  Fetched 602 kB in 1s (356 kB/s)
  Selecting previously unselected package libapt-inst2.0:amd64.
  (Reading database ... 13064 files and directories currently installed.)
  Preparing to unpack .../libapt-inst2.0_1.4.8_amd64.deb ...
  </code></pre>
  
  <p>I tried methods specified in GitHub issues and suggestions.</p>
  
  <pre><code>RUN DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends apt-utils
  </code></pre>
  
  <p>and also</p>
  
  <pre><code>RUN apt-get update &amp;&amp; apt-get install -y --no-install-recommends apt-utils
  </code></pre>
  
  <p>But none worked and still, the error is there.</p>
  
  <p>Further running the process gives the following error</p>
  
  <pre><code>/usr/src/php/ext/intl/idn/idn.c: In function 'php_intl_idn_to':
  /usr/src/php/ext/intl/idn/idn.c:227:4: warning: 'uidna_IDNToASCII_57' is deprecated [-Wdeprecated-declarations]
      converted_ret_len = uidna_IDNToASCII(ustring, ustring_len, converted, MAXPATHLEN, (int32_t)option, &amp;parse_error, &amp;status);
      ^~~~~~~~~~~~~~~~~
  In file included from /usr/include/unicode/platform.h:23:0,
                   from /usr/include/unicode/ptypes.h:50,
                   from /usr/include/unicode/umachine.h:44,
                   from /usr/include/unicode/utypes.h:36,
                   from /usr/include/unicode/uidna.h:20,
                   from /usr/src/php/ext/intl/idn/idn.c:28:
  /usr/include/unicode/uidna.h:673:1: note: declared here
   uidna_IDNToASCII(  const UChar* src, int32_t srcLength,
   ^
  /usr/src/php/ext/intl/idn/idn.c:229:4: warning: 'uidna_IDNToUnicode_57' is deprecated [-Wdeprecated-declarations]
      converted_ret_len = uidna_IDNToUnicode(ustring, ustring_len, converted, MAXPATHLEN, (int32_t)option, &amp;parse_error, &amp;status);
      ^~~~~~~~~~~~~~~~~
  In file included from /usr/include/unicode/platform.h:23:0,
                   from /usr/include/unicode/ptypes.h:50,
                   from /usr/include/unicode/umachine.h:44,
                   from /usr/include/unicode/utypes.h:36,
                   from /usr/include/unicode/uidna.h:20,
                   from /usr/src/php/ext/intl/idn/idn.c:28:
  /usr/include/unicode/uidna.h:720:1: note: declared here
   uidna_IDNToUnicode(  const UChar* src, int32_t srcLength,
   ^
  </code></pre>