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No, they key did not change. Any key changes are broadcasted to all
lists
including trinity-announce.
The error message you posted refers to ppa.launchpad.net; TDE is
hosted on oops
ppa.quickbuild.pearsoncomputing.net. Did you add a Launchpad PPA
recently
without adding its signing key?
Right I did so and because I could not receive the key I deleted the relevant ppa and run apt-get update again, but somehow the ppa remains in the cache...
Look in /etc/apt/sources.list.d/ as the faulty PPA may have added additional source lines there.
Tim