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When I run sudo apt-get update I have the following output:

Hit http://mirror.transact.net.au stable Release.gpg
Ign http://mirror.transact.net.au/debian/ stable/contrib Translation-en
Ign http://mirror.transact.net.au/debian/ stable/contrib Translation-en_AU
Ign http://mirror.transact.net.au/debian/ stable/main Translation-en
Ign http://mirror.transact.net.au/debian/ stable/main Translation-en_AU
Ign http://mirror.transact.net.au/debian/ stable/non-free Translation-en
Ign http://mirror.transact.net.au/debian/ stable/non-free Translation-en_AU
Hit http://mirror.transact.net.au stable Release             
Hit http://mirror.transact.net.au stable/main amd64 Packages
Hit http://mirror.transact.net.au stable/contrib amd64 Packages
Hit http://mirror.transact.net.au stable/non-free amd64 Packages
Get:1 http://www.debian-multimedia.org squeeze Release.gpg [198 B]
Ign http://www.debian-multimedia.org/ squeeze/main Translation-en
Ign http://www.debian-multimedia.org/ squeeze/main Translation-en_AU
Ign http://www.debian-multimedia.org/ squeeze/non-free Translation-en
Ign http://www.debian-multimedia.org/ squeeze/non-free Translation-en_AU
Get:2 http://www.debian-multimedia.org squeeze Release [22.0 kB]
Ign http://www.debian-multimedia.org squeeze Release
Get:3 http://www.debian-multimedia.org squeeze/main amd64 Packages [72.8 kB]
Get:4 http://www.debian-multimedia.org squeeze/non-free amd64 Packages [3,902 B]
Fetched 98.9 kB in 3s (32.6 kB/s)   
Reading package lists... Done
W: GPG error: http://www.debian-multimedia.org squeeze Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 07DC563D1F41B907

I've scoured the web but can only find esoteric solutions I cannot understand.

Is there a way to bypass the security feature blocking it without engaging in esoteric commandline?

share|improve this question
up vote 3 down vote accepted

As you can find on the Debian Multimedia home page

The first package to install is debian-multimedia-keyring.

Since Squeeze you can install this package with apt-get but you need to press Y when the package ask what to do and do not press return.

So, summing up, don't care about apt-get update warning, install the named package and answer Y when asked.

share|improve this answer
I installed debian-multimedia-keyring. I don't know if this was expected but apt-get update succeeded after I did this. Problem is when I try to install acroread in Synaptic, dozens of dependencies are not automatically resolved and it refuses to proceed: acroread: Depends: acroread-l10n-en but it is not going to be installed or acroread-l10n Depends: acroread-debian-files but it is not going to be installed Depends: acroread-data but it is not going to be installed Depends: ia32-libs-xulrunner but it is not going to be installed – ptrcao Sep 2 '11 at 17:29
That apt-get succeed is expected. For acroread post another question, with all relevant details. – enzotib Sep 2 '11 at 17:33

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