To install libkidletime4 just follow these instructions.
sudo apt-get install libkidletime4
Which will install libkidletime4 and any other packages on which it depends.
|Maintainer||Kubuntu Developers <email@example.com>|
|Description||library to provide information about idle time user activity or inactivity. It is useful not only for finding out about the current idle time of the PC, but also for getting notified upon idle time events, such as custom timeouts, or user activity.|