Comment 9 for bug 1969949

Landscape Server 19.10.8 has moved from the obsolete postgresql-plpython-10 package to postgresql-plpython3-10. The schema upgrade will fail if you do not have the plpython3 package available. Please see the warning and directions here: https://docs.ubuntu.com/landscape/en/ReleaseNotes19.10#upgrading-a-manual-installation-deployment