I tested this on a bionic system and saw the new error message.
bdmurray@clean-bionic-amd64:~$ tail -n1 /etc/update-manager/release-upgrades
Prompt=lts
bdmurray@clean-bionic-amd64:~$ apt-cache policy ubuntu-release-upgrader-core
ubuntu-release-upgrader-core:
Installed: 1:18.04.30
Candidate: 1:18.04.30
Version table:
*** 1:18.04.30 100
100 /var/lib/dpkg/status
1:18.04.29 500
500 http://192.168.10.7/ubuntu bionic-updates/main amd64 Packages
500 http://192.168.10.7/ubuntu bionic-updates/main i386 Packages
1:18.04.17 500
500 http://192.168.10.7/ubuntu bionic/main amd64 Packages
500 http://192.168.10.7/ubuntu bionic/main i386 Packages
bdmurray@clean-bionic-amd64:~$ do-release-upgrade
Checking for a new Ubuntu release
There is no development version of an LTS available.
To upgrade to the latest non-LTS develoment release
set Prompt=normal in /etc/update-manager/release-upgrades.
** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic
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https://bugs.launchpad.net/bugs/1798618
Title:
confusing error message with 'do-release-upgrade -d' and Prompt=lts
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