You can uninstall or removes an installed libkidletime4 package itself from Debian 8 (Jessie) through the terminal,
$ sudo apt-get remove libkidletime4
If you would like to remove libkidletime4 and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove libkidletime4
If you use with purge options to libkidletime4 package all the configuration and dependent packages will be removed.
$ sudo apt-get purge libkidletime4
If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.
$ sudo apt-get purge --auto-remove libkidletime4
I'm very pleased to share my working experience in the Linux field and have posted articles in this website — bits and pieces learned throughout my career.
