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        cloud-init's distro support for instructions on using
        these config options.

        .. note::
            To ensure that apt configuration is valid yaml, any strings
            containing special characters, especially ``:`` should be quoted.

        .. note::
            For more information about apt configuration, see the
            ``Additional apt configuration`` example.a-	        apt:
          preserve_sources_list: false
          disable_suites:
            - $RELEASE-updates
            - backports
            - $RELEASE
            - mysuite
          primary:
            - arches:
                - amd64
                - i386
                - default
              uri: 'http://us.archive.ubuntu.com/ubuntu'
              search:
                - 'http://cool.but-sometimes-unreachable.com/ubuntu'
                - 'http://us.archive.ubuntu.com/ubuntu'
              search_dns: false
            - arches:
                - s390x
                - arm64
              uri: 'http://archive-to-use-for-arm64.example.com/ubuntu'

          security:
            - arches:
                - default
              search_dns: true
          sources_list: |
              deb $MIRROR $RELEASE main restricted
              deb-src $MIRROR $RELEASE main restricted
              deb $PRIMARY $RELEASE universe restricted
              deb $SECURITY $RELEASE-security multiverse
          debconf_selections:
              set1: the-package the-package/some-flag boolean true
          conf: |
              APT {
                  Get {
                      Assume-Yes 'true';
                      Fix-Broken 'true';
                  }
              }
          proxy: 'http://[[user][:pass]@]host[:port]/'
          http_proxy: 'http://[[user][:pass]@]host[:port]/'
          ftp_proxy: 'ftp://[[user][:pass]@]host[:port]/'
          https_proxy: 'https://[[user][:pass]@]host[:port]/'
          sources:
              source1:
                  keyid: 'keyid'
                  keyserver: 'keyserverurl'
                  source: 'deb [signed-by=$KEY_FILE] http://<url>/ bionic main'
              source2:
                  source: 'ppa:<ppa-name>'
              source3:
                  source: 'deb $MIRROR $RELEASE multiverse'
                  key: |
                      ------BEGIN PGP PUBLIC KEY BLOCK-------
                      <key data>
                      ------END PGP PUBLIC KEY BLOCK-------
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    @param srcdict: a dict containing elements required
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