Install libakonadi-kcal4 by entering the following commands in the terminal:
sudo apt update sudo apt install libakonadi-kcal4
Description:
Akonadi calendar access library
This library provides calendar manipulation helpers using the Akonadi PIM data server. . This package is part of the KDE Development Platform PIM libraries module.
Homepage: http://pim.kde.org/
Version: 4:4.14.10-1ubuntu7
Section: universe/libs