Running OpenSuSE? Suddenly getting a message about MISSING KEYS: GPG#6b9d6523 from APT or Smart? It’s because the OpenSuSE maintainers have failed to include all the necessary keys in their repository.

Solution:

  1. Download GPG key 6b9d6523 manually, say via wget -o key.txt "http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x6B9D6523"
  2. Use rpm --import key.txt

Posted here for the benefit of people Googling the problem. Share and enjoy.