Adding my own Root-CA to my Lucid box

[Andreas Hergesell]

Hi,

i want to add my own Root-Ca to the system-wide trusted Root-Certificates.
How can i do this on my Kubuntu 10.04?

I added it already to kleopatra, but i cannot set it to "always trusted" and 
it is not trusted automatically.
So, the certificate (signed by root) is not trusted when i use Kmail to access 
my mails. Which is my real goal.
The error message tells me:
----------snip---------------------------------------------------
Die Echtheitsprüfung des Servers (xxx) ist fehlgeschlagen.
(authenticity check failed)
Das Zertifikat der Beglaubigungsstelle ist ungültig.
(cert not valid)
Dem Zertifikat der Haupt-Beglaubigungsstelle kann zu diesem Zweck nicht 
vertraut werden.
(Root-CA cannot be trusted for this purpose)
Das Zertifikat kann aus internen Gründen nicht überprüft werden.
(The Cert cannot be validated for internal reasons)
-----------------------------------------------------------------
Even worse, when i click in this case to "always trust Certificate" the next 
time i start Kontact i'm getting the error message again.

The Certificate works fine in Firefox and Kubuntu Karmic...

who can give me a hint?

Thanks

Andreas