You sure you followed these steps?

gpg --keyserver keyserver.ubuntu.com --recv-key 428D7C01
gpg --check-sigs 428D7C01 # signed by key of Martin Pitt
gpg -o - --export 428D7C01 | sudo apt-key add -

Another (not recommended) method could be:

wget -q http://ddebs.ubuntu.com/dbgsym-release-key.asc
sudo apt-key add dbgsym-release-key.asc

-- 
Message failure while setting up the debug mode in hardy (installing package 
multiverse) Public key problem, GPG error
https://bugs.launchpad.net/bugs/315726
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