I am a long time Mint user, but new here to the forums. I recently switched to LMDE last month. I installed the 201109 release and did not install any updates until Update Pack 3. I am only using the three Mint Debian update sources (as instructed in Update 3 docs).
Today was the first time I received an update since UP3. The file updated was debian-system-adjustments. I received no errors when the update installed, but now when I check for updates, I receive a bad signature error:
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W: GPG error: http://debian.linuxmint.com testing Release: The following signatures were invalid: BADSIG 07DC563D1F41B907 Christian Marillat <email@example.com>
What should I do about this? I appreciate your help.