Okay. I have tryed to get help, but with no success at the moment.

The problem is that whenever i do an update it won't accept my key
An error accured
W: GPG error: http://packages.medibuntu.org gutsy Release: folowing signatures could not be viryfied because public key is not available: NO_PUBKEY 2EBC26B60C5A2783
(Translated)

Then i tryed to type in the terminal:
gpg --keyserver hkp://subkeys.pgp.net --recv-keys KEY
gpg --export --armor KEY | sudo apt-key add -
That did not solved the problem.
Then i tryed:
sudo aptitude update and that did not solve the problem.


>My computer name<:~$ gpg --keyserver hkp://subkeys.pgp.net --recv-keys 2EBC26B60C5A2783
gpg: requesting key 0C5A2783 from hkp server subkeys.pgp.net
gpg: /home/kim/.gnupg/trustdb.gpg: trustdb created
gpg: key 0C5A2783: public key "Medibuntu Packaging Team <admin@lists.medibuntu.org>" imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg: imported: 1
>My computer name<:~$ gpg --export --armor 2EBC26B60C5A2783 | sudo apt-key add - 



>My computer name<:~$ gpg --keyserver hkp://subkeys.pgp.net --recv-keys 2EBC26B60C5A2783
gpg: requesting key 0C5A2783 from hkp server subkeys.pgp.net
gpg: key 0C5A2783: "Medibuntu Packaging Team <admin@lists.medibuntu.org>" not changed
gpg: Total number processed: 1
gpg: unchanged: 1
>My computer name<:~$ gpg --export --armor 0C5A2783 | sudo apt-key add -