KCron
Program scheduler frontend
Task Scheduler is a graphical front end to the standard "cron" utility. With it, commands (or "tasks") can be run at specific times, on a certain day or date, or at specific intervals (time between execution).
kde-config-cron is a KDE configuration module for scheduling programs to run at specific intervals using cron, the UNIX scheduling service. . This package is part of the KDE administration module.
How to install KCron in Ubuntu
If you are on a supported distro, you can install the application through software center by clicking the below link.
If the above link not working, run the below command in terminal to install kde-config-cron in Ubuntu
sudo apt install kde-config-cron