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After the first installing followed the download from internet by upgrade manager. The packages make downloaded, but in the moment to prepare the instalation is komming the error signal with the following mesaje:

W: GPG error: http://security.debian.org testing/updates Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY AED4B06F473041FA
W: GPG error: http://ftp.debian.org testing Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY AED4B06F473041FA

I am waiting from you all for a solution.
Thanks, Peter.

I have seen this problem in the Mint 10 bit not LMDE. The solution is here:

http://en.kioskea.net/faq/809-debian-ap ... -gpg-error

Good Luck