If you encounter the following error when updating, I listed below the steps to fix it.
"W: GPG error: http://security.debian.org squeeze/updates Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY AED4B06F473041FA"
1. check all the keys installed on your server for debian repository.
$apt-key list
2. Install the debian-archive-keyring.
$apt-get install debian-archive-keyring
#You should be able to see the following:
pub 4096R/B98321F9 2010-08-07 [expires: 2017-08-05] uid Squeeze Stable Release Key pub 1024D/F42584E6 2008-04-06 [expires: 2012-05-15] uid Lenny Stable Release Key pub 4096R/55BE302B 2009-01-27 [expires: 2012-12-31] uid Debian Archive Automatic Signing Key (5.0/lenny) pub 2048R/6D849617 2009-01-24 [expires: 2013-01-23] uid Debian-Volatile Archive Automatic Signing Key (5.0/lenny) pub 4096R/473041FA 2010-08-27 [expires: 2018-03-05] uid Debian Archive Automatic Signing Key (6.0/squeeze)
3. Update your Debian server now.
$apt-get update
Another Case:
Incase you encountered the error below.
"W: GPG error: http://www.debian-multimedia.org testing Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 07DC563D1F41B907"
Fix:
$apt-get install debian-multimedia-keyring
3. You can now execute your update
$apt-get update
If it doesn't work try this!
rm /var/lib/apt/lists/* -vf apt-get clean apt-get update
Another Case:
W: GPG error: ftp://ftp.deb-multimedia.org squeeze Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 07DC563D1F41B907 W: GPG error: ftp://ftp.deb-multimedia.org squeeze-backports Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 07DC563D1F41B907
Fix:
#Insert below in your /etc/apt/sources.list.
deb ftp://ftp.deb-multimedia.org squeeze main non-free deb ftp://ftp.deb-multimedia.org squeeze-backports main
Console:
#Add Key
apt-get install debian-keyring gpg --keyring /usr/share/keyrings/debian-keyring.gpg -a --export 07DC563D1F41B907 |apt-key add -
Another Case:
"W: GPG error: http://nginx.org squeeze Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY ABF5BD827BD9BF62"
Fix:
#Insert below in your /etc/apt/sources.list.
deb http://packages.dotdeb.org stable all
Console:
#Add Key
gpg --keyserver keyserver.ubuntu.com --recv-key ABF5BD827BD9BF62 gpg -a --export ABF5BD827BD9BF62 | apt-key add - apt-get update
Another Case:
W: GPG error: http://packages.dotdeb.org stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY E9C74FEEA2098A6E
Fix:
#Insert below in your /etc/apt/sources.list.
deb http://packages.dotdeb.org stable all
Console:
#Add Key
wget http://www.dotdeb.org/dotdeb.gpg cat dotdeb.gpg | apt-key add - rm dotdeb.gpg
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