apt4 rpm suse 10.0 serious key signing problem

[mrn]

Hi,
it´s my first post here, so I would like to say hello.

My distribution is Suse 10.0 and I have been working with apt as package manager for some time without problems.
Now I wanted to update kde from 3.5.3 to 3.5.5., but whatever I try to do, it says: key signing problems.

I tried to import all the keys: rpm import...

Then I tried this:

apt install --no-checksig kdebase3
You don't seem to have one or more of the needed GPG keys in your RPM database.
Importing them now...
GPG key not imported correctly
GPG id: gpg-pubkey-5f6842a4-3f045e14
File: /usr/lib/rpm/gnupg/packman-henvol.asc
E: Error while running transaction
E: Handler silently failed

rpm --import ftp://ftp.links2linux.de/pub/packman/public-keys.asc

and I also changed the /etc/apt/apt.conf.d/gpg-checker.conf from
GPG::Check true; to false

it still told me there were missing keys. I am beginning to suspect a serious problem.
I hope this is quite clear. Please excuse my english, I am doing my best. Thanks a lot for your help and ideas.

[mrn]

Hi,
nobody had an idea about how to proceed?
Whatever I do, the problem is still there. How can it say key problems when I used th option "--no-checksig" and when I even deactivated the option in the configuration file?
What´s going on? Thanks for any help