Install casacore-data-tai-utc by entering the following commands in the terminal:
sudo apt update sudo apt install casacore-data-tai-utc
Difference table between TAI and UTC for casacore
This package contains the leap second difference between TAI and UTC, created from /usr/share/zoneinfo/leap-seconds.list. The data are in a format specific to casacore. The table is kept in sync with the tzdata package.