Comment 7 for bug 1798618

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.