Question: how to configure rkhunter in ubuntu?
Answer: To run rkhunter --propupd, automatic after software updates, add the line APT_AUTOGEN="yes" to /etc/default/rkhunter (this gets read by /etc/apt/apt. conf. ... 
Wait till it completes gathering the new values, then exit. ... 
Additionally, the --versioncheck option of rkhunter itself will indicate if a new version is available.