You can clean the apt cache by using the following command in your terminal:
sudo apt-get clean
This command will clean out the local repository of retrieved package files, which can free up disk space on your system. You can also use the following command to clean out old package files that are no longer required by your system:
sudo apt-get autoclean
The autoclean command removes only package files that can no longer be downloaded and are only taking up space on your system.
It is a good idea to periodically clean the apt cache to free up disk space and ensure that your package repositories are up to date.