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Thank you very much! Now, it works! :)

How do I install the keyring? "sudo apt install suldr-keyring" doesn't work.

Thank for your reply. But Ubuntu doesn't want to at step 4/5 :(

Holen:6 http://www.bchemnet.com/suldr debian InRelease [11,8 kB]                 
Fehl:6 http://www.bchemnet.com/suldr debian InRelease                 
  Die folgenden Signaturen konnten nicht überprüft werden, weil ihr öffentlicher Schlüssel nicht verfügbar ist: NO_PUBKEY C95104E509BAC46D  NO_PUBKEY FB510D557CC3E840
OK:7 http://archive.ubuntu.com/ubuntu xenial-backports InRelease
OK:8 http://archive.ubuntu.com/ubuntu xenial-security InRelease
Paketlisten werden gelesen... Fertig                 
W: GPG-Fehler: http://www.bchemnet.com/suldr debian InRelease: Die folgenden Signaturen konnten nicht überprüft werden, weil ihr öffentlicher Schlüssel nicht verfügbar ist: NO_PUBKEY C95104E509BAC46D  NO_PUBKEY FB510D557CC3E840
E: The repository 'http://www.bchemnet.com/suldr debian InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

Hello,

I added the repository and the key. If I type sudo apt update I got the error:

W: GPG-Fehler: http://www.bchemnet.com/suldr debian InRelease: Die folgenden Signaturen konnten nicht überprüft werden, weil ihr öffentlicher Schlüssel nicht verfügbar ist: NO_PUBKEY C95104E509BAC46D  NO_PUBKEY FB510D557CC3E840
E: The repository 'http://www.bchemnet.com/suldr debian InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details

The German part says that the public key was not found.

Thanks for your help! :)