As you're using Kubuntu, you might be interested in this bug: https://bugs.launchpad.net/kdelibs/+bug/295266
It won't fix KDE's cert handling but makes the global ca-certificates available to KDE; just do a sudo ln -sf /etc/ssl/certs/ca-certificates.crt /usr/share/kde4/apps/kssl/ca-bundle.crt and you'll have at least CAcert and stuff recognized in KDE.
As you're using Kubuntu, you might be interested in this bug: /bugs.launchpad .net/kdelibs/ +bug/295266
https:/
It won't fix KDE's cert handling but makes the global ca-certificates available to KDE; just do a certs/ca- certificates. crt /usr/share/ kde4/apps/ kssl/ca- bundle. crt
sudo ln -sf /etc/ssl/
and you'll have at least CAcert and stuff recognized in KDE.