Install apper-data by entering the following commands in the terminal:
sudo apt update sudo apt install apper-data
KDE package management tool using PackageKit (data files)
PackageKit allows performing simple software management tasks over a DBus interface e.g. refreshing the cache, updating, installing and removing software packages or searching for multimedia codecs and file handlers. . This package provides data files for Apper, the KDE package manager based on PackageKit.