Comment 16 for bug 256245

<https://wiki.ubuntu.com/KarmicKoala/ReleaseNotes#Kubuntu%20GUI%20package%20manager%20does%20not%20warn%20about%20installing%20from%20unsigned%20package%20repositories>:

The kpackagekit package manager used in Kubuntu 9.10 does not notify users if the packages they are installing come from repositories that are not secured with PGP. Users who have unsigned package repositories in their /etc/apt/sources.list configuration and wish to be informed of any packages installed from these sources should use the apt-get commandline tool as a workaround. (256245)