Something is wrong with the name resolution service the system which you
are trying to upgrade is using. From VarLogDistupgradeMainlog.txt we can
see:
2019-04-23 00:26:37,923 DEBUG examining: 'deb
http://us.archive.ubuntu.com/ubuntu/ bionic main restricted'
2019-04-23 00:26:37,923 DEBUG verifySou
** Tags added: bionic2cosmic
** Tags added: third-party-packages
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https://bugs.launchpad.net/bugs/1825944
Title:
crash on do-release-upgrade
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