Version 0+git2018.12.08-1 of casacore-data-observatories is marked for autoremoval from testing on Sun 05 Jan 2020. It depends (transitively) on casacore, affected by #936274. You should try to prevent the removal by fixing these RC bugs.
Last update: 2019-12-07
Standards version of the package is outdated.
The package should be updated to follow the last version of Debian Policy
(Standards-Version 4.4.1 instead of