Verified for an upgrade from Bionic to Cosmic:

bdmurray@clean-bionic-amd64:~$ grep conffile-prompt 
/var/log/dist-upgrade/main.log 
2019-05-14 16:19:53,226 WARNING got a conffile-prompt from dpkg for file: 
'/etc/update-manager/release-upgrades'
2019-05-14 16:19:58,232 WARNING replied no to the conffile-prompt for file: 
'/etc/update-manager/release-upgrades'
bdmurray@clean-bionic-amd64:~$ head -n10 /var/log/dist-upgrade/main.log 
2019-05-14 16:03:25,448 INFO Using config files '['./DistUpgrade.cfg']'
2019-05-14 16:03:25,448 INFO uname information: 'Linux clean-bionic-amd64 
4.15.0-48-generic #51-Ubuntu SMP Wed Apr 3 08:28:49 UTC 2019 x86_64'
2019-05-14 16:03:25,783 INFO apt version: '1.6.10'
2019-05-14 16:03:25,784 INFO python version: '3.6.7 (default, Oct 22 2018, 
11:32:17) 
[GCC 8.2.0]'
2019-05-14 16:03:25,786 INFO release-upgrader version '18.10.11.8' started
2019-05-14 16:03:25,799 INFO locale: 'en_US' 'UTF-8'
2019-05-14 16:03:25,871 DEBUG setting up environ for non-interactive use
2019-05-14 16:03:26,083 DEBUG Using 'DistUpgradeViewNonInteractive' view
2019-05-14 16:03:26,117 DEBUG enable dpkg --force-overwrite

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https://bugs.launchpad.net/bugs/1796193

Title:
  DistUpgradeViewNonInteractive crashes / requires interaction

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